What the board asks
We went through the ISC board papers, question by question, and matched each question to a topic. Here is what was asked, how often, and what was never asked.
Physics: 427 topics in the 2027 syllabus, across 9 units. The board has asked 269 of them at least once. 158 were never asked in the papers we checked.
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P6 Optics
All the topics in Physics: Optics
Asked topics first, the most asked at the top. Tap a topic to see what to write, the result, the years, and the real board questions.
80 topics shown
| # | Topic | Type | Marks | Times asked | Last asked | Status |
|---|---|---|---|---|---|---|
| 1 | Lenses: give-reason on focal length, nature and brightnessAnswer with a reason from the lens maker's formula: factors on which the focal length depends, why focal length rises (power falls) when a lens is in water or coated with a water film, when a convex lens acts as a diverging lens, and what happens to the image when half the lens is covered or cut away. | Give reason | 1 | 4 papers | Specimen 2027 | Asked |
| 2 | Reflecting versus refracting telescope: advantages and disadvantagesWrite a table of differences between reflecting and refracting telescopes (objective used, aberrations, aperture and brightness, resolving power, mounting and cost) and list advantages and disadvantages of the reflecting type. | Comparison | 1 | 4 papers | Specimen 2027 | Asked |
| 3 | Compound microscope versus astronomical telescope: lenses and reasonsCompare the two instruments on the focal length and aperture of objective and eyepiece, the position of the object, the adjustment used and the purpose, giving the reason for each choice of focal length and aperture. | Comparison | 1 | 4 papers | Specimen 2027 | Asked |
| 4 | Double slit: changing lambda, d, D; closing one slitPredict with a reason from beta = lambda D/d what happens to the fringe width and to the position of a given fringe when the wavelength (colour), the slit separation or the screen distance is changed, and say what is seen when one slit is closed; practise it in the 'is the student's answer correct, if not correct it' format. | Give reason | 1 | 4 papers | Specimen 2027 | Asked |
| 5 | Prove the law of reflection using Huygens' principleDraw a plane wavefront AB striking a plane mirror obliquely, construct the secondary wavelet from A of radius v t drawn in the time B takes to reach C (BC = v t), draw the reflected wavefront CD as the tangent from C to that wavelet, and prove triangles ABC and CDA congruent so that angle i = angle r; label the wavefronts, rays, normal, i and r. | Derivation | 3 | 4 papers | 2026 | Asked |
| 6 | Dispersion: give-reason and judge-the-claim itemsExplain in two or three lines why white light splits in a prism, which colour deviates most and why, and why a larger minimum deviation does not by itself mean a larger dispersive power. | Give reason | 1 | 3 papers | Specimen 2027 | Asked |
| 7 | Compare interference fringes with single slit diffraction patternDraw a table of differences between the double slit interference pattern and the single slit diffraction pattern (cause, widths of the bands, brightness of successive maxima, condition for dark bands), identify which of two pictured patterns is which, and state what both phenomena prove about the nature of light. | Comparison | 1 | 3 papers | Specimen 2027 | Asked |
| 8 | Numericals: lens maker's formula for biconvex, biconcave, plano-convex lensesCompute the focal length (or a radius or the refractive index) of a biconvex, biconcave or plano-convex lens from its radii, and compare focal lengths when a lens is cut into a plano-convex piece. | Numericals | 2 | 3 papers | 2026 | Asked |
| 9 | Numericals: power and focal length of lenses in contactAdd the powers (with sign) of thin lenses in contact and give the focal length and nature of the combination, or find one lens from the combination. | Numericals | 2 | 3 papers | 2026 | Asked |
| 10 | Derive the prism formula for minimum deviationDraw a ray through the principal section of a prism with i1, r1, r2, i2 and the deviation marked, prove A = r1 + r2 and delta = i1 + i2 - A, apply the minimum-deviation conditions i1 = i2 = i and r1 = r2 = r, and use Snell's law to get n in terms of A and delta_m. | Derivation | 3 | 3 papers | 2025 | Asked |
| 11 | Prove Snell's law using Huygens' principleDraw a plane wavefront AB meeting the boundary between a rarer medium (speed v1) and a denser medium (speed v2) obliquely, construct the wavelet from A of radius v2 t in the second medium drawn in the time B travels BC = v1 t in the first, draw the refracted wavefront CD, mark i and r, and show that sin i / sin r = v1/v2 = constant = refractive index of the second medium with respect to the first. | Derivation | 3 | 3 papers | 2025 | Asked |
| 12 | Ray diagrams: convex and concave lens, every object positionDraw the ray diagram for each object position of a convex lens (infinity, beyond 2F, at 2F, between F and 2F, at F, between F and O) and for a concave lens, and tabulate position, nature and size of the image and one use of each case. | Diagram | 1 | 3 papers | 2024 | Asked |
| 13 | Mirrors: give-reason items and usesAnswer in one or two lines with the reason: whether the focal length of a mirror changes when it is put in water, which mirror and object position gives a stated image, and one use each of a concave and a convex mirror with why that mirror suits it. | Give reason | 1 | 2 papers | Specimen 2027 | Asked |
| 14 | Numericals: refractive index from A and minimum deviationUse the prism formula to find n from A and delta_m, or delta_m or the angle of incidence at minimum deviation from n and A, reading the angles correctly from a spectrometer-style figure when one is given. | Numericals | 2 | 2 papers | Specimen 2027 | Asked |
| 15 | Lab-style lens questions: focal length methods and graphsExplain how to find the focal length of a convex lens with only a metre scale (distant object method), how object and image pins are moved in the no-parallax method to change image size, which quantities go on which axis in the 1/v against 1/u graph and how f is read from its intercepts, and judge a student's stated answer as correct or incorrect with a reason. | Give reason | 1 | 2 papers | Specimen 2027 | Asked |
| 16 | Simple microscope: numericals and effect of focal lengthCalculate the magnifying power of a magnifying glass for the image at D and at infinity, the object distance needed, or the focal length for a wanted magnifying power; state how M changes when f or the power of the lens changes. | Numericals | 1 | 2 papers | Specimen 2027 | Asked |
| 17 | Reflecting telescope: labelled ray diagram, image at infinityDraw parallel rays from a distant object falling on a large concave (parabolic) objective mirror, sent by a small secondary mirror to the eyepiece, with the final image at infinity; label the parts and state the role of the mirror and of the lens. | Diagram | 2 | 2 papers | Specimen 2027 | Asked |
| 18 | Numericals: focal length of a lens immersed in a liquidFind the new focal length and nature of a glass lens placed in a liquid of given refractive index, the ratio of its focal lengths in liquid and in air, or the liquid index for which the lens stops acting as a lens. | Numericals | 2 | 2 papers | 2026 | Asked |
| 19 | Refracting telescope, image at infinity: ray diagram and derivationDraw parallel rays from a distant object forming a real inverted image in the common focal plane of objective and eyepiece with the final image at infinity, mark alpha and beta, and derive the magnifying power and the tube length. | Derivation | 5 | 2 papers | 2026 | Asked |
| 20 | Numericals: critical angle and grazing emergenceFind the critical angle for a pair of media, or the unknown refractive index when a ray just grazes the interface, including a glass face covered by a liquid. | Numericals | 2 | 2 papers | 2025 improvement | Asked |
| 21 | Primary versus secondary rainbow (differences)Write at least three differences between the primary and the secondary rainbow: number of internal reflections, order of colours, brightness, and angular position. | Comparison | 2 | 2 papers | 2025 | Asked |
| 22 | Simple microscope, image at D: ray diagram and derivationDraw a convex lens of short focal length with the object between F and the optical centre and the virtual, erect, magnified image at D, mark the visual angles, and derive the magnifying power using the lens formula with v = -D. | Derivation | 5 | 2 papers | 2025 | Asked |
| 23 | Numericals: compound microscope magnifying power and tube lengthApply the lens formula to the objective, then to the eyepiece (final image at D or at infinity), and compute the magnifying power and the separation of the lenses. | Numericals | 3 | 2 papers | 2025 improvement | Asked |
| 24 | Conditions for constructive and destructive interferenceWrite the path difference and the phase difference needed for constructive (bright) and for destructive (dark) interference, and give the resultant amplitude and intensity in each case for two identical waves of amplitude a. | Statement | 1 | 2 papers | 2025 improvement | Asked |
| 25 | Young's double slit experiment: labelled set-up and patternDraw the labelled arrangement (monochromatic source, single slit S, double slits S1 and S2 a distance d apart, screen at distance D, central point O and a point P on the screen) and describe what is seen: alternate bright and dark fringes of equal width with a bright central fringe; define fringe width. | Diagram | 2 | 2 papers | 2025 improvement | Asked |
| 26 | Numericals: general prism with i, e, A and deviationApply Snell's law at each face together with A = r1 + r2 and delta = i + e - A to find the prism angle, the angle of emergence, the deviation, or the angle of incidence for which the emergent ray just grazes the second face. | Numericals | 3 | 2 papers | 2024 | Asked |
| 27 | Instrument terms: D, visual angle, magnifying power, normal useDefine least distance of distinct vision, visual angle, magnifying power (angular magnification) of a microscope and of a telescope, say what 'normal use' of a microscope and 'normal adjustment' of a telescope mean, and name the instrument suited to a tiny near object and to a distant object. | Statement | 1 | 2 papers | 2024 | Asked |
| 28 | Shapes of wavefronts: spherical, cylindrical, planeDraw the three wavefront shapes with their rays and name the source that gives each: a point source (spherical), a line source or narrow slit (cylindrical), and a source at a very large distance or a parallel beam (plane). | Diagram | 1 | 2 papers | 2024 | Asked |
| 29 | Derive double slit fringe positions and fringe widthFrom the labelled diagram deduce the path difference S2P - S1P = d sin theta, set it equal to n lambda for a bright fringe and (n + 1/2) lambda for a dark fringe, use sin theta = tan theta = y_n/D for small theta to get the distances of the nth bright and dark fringes from the centre, and subtract consecutive positions to get the fringe width. | Derivation | 3 | 2 papers | 2024 | Asked |
| 30 | Graph: intensity against angle for single slit diffractionDraw intensity against diffracting angle theta (or sin theta): a tall, wide central peak at theta = 0, zeros at sin theta = +/- lambda/a, +/- 2 lambda/a, ..., and small secondary peaks of rapidly decreasing height near +/- 3 lambda/2a and +/- 5 lambda/2a; label both axes, the minima and the maxima. | Graph | 2 | 2 papers | 2024 | Asked |
| 31 | Numericals: mirror formula and magnificationFrom any two of u, v, f (or R) and the object height, find the third, the image height and the nature of the image for concave and convex mirrors, writing signs explicitly. | Numericals | 1 | 2 papers | 2023 | Asked |
| 32 | Derive refraction formula for a single convex spherical surfaceDraw a point object on the axis in the rarer medium n1 in front of a convex spherical surface of a denser medium n2 forming a real image inside it, mark i, r and the angles alpha, beta, gamma at O, C and I, use Snell's law for small angles and the sign convention to relate n1, n2, u, v and R. | Derivation | 3 | 2 papers | 2023 | Asked |
| 33 | Coherent and incoherent sources; conditions for sustained interferenceDefine coherent sources and incoherent sources with one example of each, explain why two independent lamps cannot give a steady pattern and how Young obtained two coherent sources from a single source, and list the conditions for sustained interference. | Statement | 1 | 2 papers | 2023 | Asked |
| 34 | Numericals: fringe width and position of nth fringeUse beta = lambda D/d and y_n = n lambda D/d (bright) or (n + 1/2) lambda D/d (dark) to find any one of beta, y_n, lambda, d or D from the others, working in SI units. | Numericals | 2 | 2 papers | 2023 | Asked |
| 35 | Width of central maximum and how it changesFrom the first minima on either side obtain the angular width of the central bright fringe and its linear width on the screen, and state with a reason how the width changes when the slit width, the wavelength (colour) or the screen distance is changed. | Give reason | 1 | 2 papers | 2023 | Asked |
| 36 | Ray diagrams: concave and convex mirror, every object positionDraw the ray diagram for each object position of a concave mirror (infinity, beyond C, at C, between C and F, at F, between F and P) and for a convex mirror, and write the position, nature and size of the image for each as a table. | Diagram | 1 | 2 papers | 2020 | Asked |
| 37 | Derive combined focal length of two thin lenses in contactDraw two thin lenses in contact with a point object on the axis, write the lens formula for each lens taking the image of the first as the object of the second, add them and compare with a single equivalent lens; extend to power. | Derivation | 3 | 2 papers | 2020 | Asked |
| 38 | Laws of refraction, Snell's law, refractive indexState the two laws of refraction, define absolute and relative refractive index through the speeds of light, write how relative index links to the two absolute indices, and say which of frequency, speed and wavelength change when light enters another medium. | Statement | 1 | 1 paper | Specimen 2027 | Asked |
| 39 | Numericals: image formed by a single spherical surfaceUse the single-surface relation with signs to find the image position (or R or a refractive index) for an object in front of a spherical refracting surface, and say in which medium the image lies and whether it is real. | Numericals | 2 | 1 paper | Specimen 2027 | Asked |
| 40 | What changes on refraction: frequency, speed, wavelengthState with a reason that the frequency stays the same when light passes from one medium to another while the speed and wavelength change, write the speed and wavelength in the medium in terms of the refractive index, and use the Huygens picture to say which way the wavefront turns going rarer to denser and denser to rarer. | Give reason | 1 | 1 paper | Specimen 2027 | Asked |
| 41 | Numericals: bright or dark from path differenceGiven the path difference (or phase difference) at a point and the wavelength, divide the path difference by lambda and decide whether the point is bright (whole number), dark (whole number plus a half) or in between, and give the order of the fringe. | Numericals | 1 | 1 paper | Specimen 2027 | Asked |
| 42 | Dispersion, angular dispersion, dispersive power: definitions and formulaeDefine dispersion and state its cause, define angular dispersion and dispersive power for a thin prism, and write each in terms of the deviations and of the refractive indices for violet, red and mean (yellow) light. | Statement | 1 | 1 paper | 2026 | Asked |
| 43 | Trace a ray through a 30-60-90, 45-45-90 or equilateral prismFor a ray incident (usually normally) on a named face of a prism of given angles and refractive index, find the angle of incidence at each later face from geometry, compare with the critical angle to decide refraction or total reflection, and complete the path with every angle marked. | Give reason | 2 | 1 paper | 2025 improvement | Asked |
| 44 | Ray diagram: lens with mirror, image coinciding with objectDraw the rays from an object pin through a convex lens to a plane mirror behind it and back so that the final image forms at the pin itself, and state what the pin-to-lens distance equals; repeat for a convex mirror behind the lens. | Diagram | 1 | 1 paper | 2025 improvement | Asked |
| 45 | Numericals: distance between two named fringesFind the separation between two given fringes by counting fringe widths: both on the same side of the centre (subtract the positions), on opposite sides of the central fringe (add the positions), or a bright fringe and a dark fringe. | Numericals | 2 | 1 paper | 2025 | Asked |
| 46 | Diffraction: meaning, condition, Fraunhofer arrangementDefine diffraction of light, state the condition for it to be noticeable (slit or obstacle size comparable to the wavelength), explain why it is easily noticed for sound but not for light in daily life, and say what makes the arrangement Fraunhofer (plane wavefronts: source and screen effectively at infinity, obtained with lenses). | Statement | 1 | 1 paper | 2025 | Asked |
| 47 | Lens terms, sign convention, power and dioptre, magnificationDefine optical centre, principal axis, first and second principal focus and focal length of a thin lens, state the sign convention, define power of a lens with its SI unit, and define linear magnification with the meaning of its sign. | Statement | 1 | 1 paper | 2024 | Asked |
| 48 | Rainbow: ray diagram through a raindrop, simple explanationDraw a ray of sunlight entering a spherical raindrop, dispersing, reflecting once inside and emerging towards the observer (primary rainbow), mark red and violet, and name the phenomena involved; add the two-reflection drop for the secondary rainbow. | Diagram | 2 | 1 paper | 2023 | Asked |
| 49 | Compound microscope, image at D: ray diagram and derivationDraw objective and eyepiece with the object just beyond F_o, the real inverted intermediate image inside F_e, and the final virtual image at D; derive the magnifying power as the product of the objective's linear magnification and the eyepiece's angular magnification. | Derivation | 5 | 1 paper | 2023 | Asked |
| 50 | Optical fibre: structure, principle, ray path, usesDraw a labelled section of an optical fibre (core of higher refractive index, cladding of lower, protective jacket) with a ray undergoing repeated total internal reflection, name the principle and give two uses. | Device | 2 | 1 paper | 2020 | Asked |
| 51 | i-delta graph for a prism with explanationDraw the labelled graph of angle of deviation against angle of incidence, mark delta_m and the single angle i at which it occurs, show that any other deviation corresponds to two angles of incidence (i1 and i2 interchange), and state what is special about the ray at minimum deviation. | Graph | 2 | 1 paper | 2020 | Asked |
| 52 | Wavefront and Huygens' principle: definitions and statementDefine a wavefront and a ray (a ray is normal to the wavefront), state that all points on one wavefront are in the same phase, and state Huygens' principle in two parts: every point on a wavefront acts as a source of secondary wavelets that spread at the wave speed, and the forward envelope (common tangent) of these wavelets after time t is the new wavefront. | Statement | 1 | 1 paper | 2020 | Asked |
| 53 | Critical angle and total internal reflection: definitions, sin CDefine critical angle and total internal reflection, state the two conditions for it, draw the three-ray diagram (i < C, i = C, i > C) at a denser-to-rarer interface and obtain the relation between critical angle and refractive index. | Statement | 2 | 1 paper | 2019 | Asked |
| 54 | Numericals: angular dispersion and dispersive powerFrom the deviations or the refractive indices for violet, red and yellow light, calculate the angular dispersion of a thin prism and the dispersive power of its material. | Numericals | 2 | 1 paper | 2019 | Asked |
| 55 | Graph: intensity distribution in double slit interferenceDraw intensity against angular distance (or against position y on the screen) for the double slit pattern: equally spaced maxima all of the same height with zero minima midway between them and the central maximum at theta = 0; label both axes and mark the positions of the maxima and minima. | Graph | 2 | 1 paper | 2018 | Asked |
| 56 | Spherical mirrors: terms, sign convention, magnificationDefine pole, centre of curvature, radius of curvature, principal axis, principal focus, focal length and aperture for concave and convex mirrors, state the sign convention you will use, and define linear magnification with the meaning of its sign. | Statement | 1 | never | Never asked | |
| 57 | Derive the mirror formula for a concave mirrorDraw the ray diagram for an object beyond C of a concave mirror forming a real image, use the two pairs of similar triangles, apply the sign convention and reach the mirror formula; add the magnification m = -v/u from the same figure. | Derivation | 3 | never | Never asked | |
| 58 | Combination of media: prove 1n2.2n3.3n1 = 1Draw a ray passing through parallel layers of media 1, 2, 3 and back into medium 1 with the emergent ray parallel to the incident ray, apply Snell's law at each interface and multiply the three relations. | Derivation | 2 | never | Never asked | |
| 59 | Real and apparent depth: relation with ray diagramDraw two rays from a point object at the bottom of a denser medium refracting into air to a viewer almost directly above, locate the virtual image, and use Snell's law for small angles to relate real depth, apparent depth and refractive index; write the apparent shift. | Derivation | 2 | never | Never asked | |
| 60 | Numericals: Snell's law, speed and wavelength in a mediumCompute the angle of refraction, the speed and the wavelength of light in a medium, or a relative refractive index from two absolute ones, for a ray crossing one or more plane interfaces. | Numericals | 2 | never | Never asked | |
| 61 | Numericals: real depth, apparent depth and shiftFind the apparent depth or the refractive index for an object seen through a liquid or a glass slab, the shift of the image, and the apparent depth through two liquid layers. | Numericals | 2 | never | Never asked | |
| 62 | Total reflecting prism: deviation by 90 and 180 deg, erectingDraw a 45-90-45 glass prism in its three uses: turning a ray through 90 deg, turning it back through 180 deg, and inverting an image without deviation; mark the 45 deg angle of incidence at the glass-air face and state why total internal reflection occurs there. | Diagram | 2 | never | Never asked | |
| 63 | Everyday effects of refraction and total internal reflectionExplain in two or three lines, with a small sketch where it helps: why a pool or a coin in water looks raised, why a stick looks bent at the water surface, and why a totally reflecting face or an air bubble in water shines brightly. | Give reason | 1 | never | Never asked | |
| 64 | Thin prism: derive delta = (n-1)A and use itFor a prism of small angle with a ray at near-normal incidence, replace sines by angles in Snell's law at both faces and combine with A = r1 + r2 and delta = i1 + i2 - A; then compute the deviation produced by a given thin prism. | Derivation | 2 | never | Never asked | |
| 65 | Derive the lens maker's formula for a biconvex lensTreat a thin biconvex lens as two spherical surfaces: apply the single-surface relation at the first surface, take its image as the virtual object for the second surface, add the two equations, and put u = infinity, v = f to obtain the lens maker's formula, with a labelled diagram. | Derivation | 3 | never | Never asked | |
| 66 | Derive the thin lens formula and m = v/uFrom the two-surface equations of the lens maker's derivation (or from a ray diagram of a convex lens forming a real image with similar triangles) obtain the relation between u, v and f, and derive the linear magnification. | Derivation | 3 | never | Never asked | |
| 67 | Numericals: thin lens formula, magnification and powerFrom any two of u, v, f (or power) and the object size find the third, the image size and its nature for convex and concave lenses, writing every sign. | Numericals | 2 | never | Never asked | |
| 68 | Numericals: image formed by two separated coaxial lensesFind the final image for two thin lenses a given distance apart by taking the image of the first lens as the object of the second (real or virtual object), and give the total magnification. | Numericals | 3 | never | Never asked | |
| 69 | Numericals: lens and mirror combination, step by stepFor a lens with a plane, convex or concave mirror behind it, find the final image by three steps (lens, mirror, lens again), or use the condition that the image coincides with the object to find f of the lens or R of the mirror. | Numericals | 3 | never | Never asked | |
| 70 | Simple microscope, image at infinity: ray diagram and derivationDraw the object at the focus of the convex lens with parallel emergent rays reaching the relaxed eye, mark the angles, and derive the magnifying power. | Derivation | 3 | never | Never asked | |
| 71 | Compound microscope, final image at infinity: expression onlyWrite the expression for the magnifying power of a compound microscope when the final image is at infinity, say where the intermediate image must lie, and give the tube length in this setting. | Statement | 1 | never | Never asked | |
| 72 | Refracting telescope, image at D: ray diagram and derivationDraw the telescope with the intermediate image inside the focal length of the eyepiece and the final virtual image at D, and derive the magnifying power using the eyepiece lens formula with v_e = -D; give the tube length. | Derivation | 5 | never | Never asked | |
| 73 | Numericals: telescope magnifying power and tube lengthFrom the focal lengths (or powers) of objective and eyepiece find the magnifying power and the length of an astronomical telescope in normal adjustment and with the final image at D, or find the focal lengths from M and L. | Numericals | 2 | never | Never asked | |
| 74 | Phase, path difference, phase difference, superposition: definitionsDefine the phase of a wave, the path difference and the phase difference between two waves at a point, write the relation between them, state the principle of superposition, and say what is meant by interference of light. | Statement | 1 | never | Never asked | |
| 75 | Single slit diffraction: set-up diagram and patternDraw the labelled set-up (monochromatic source, lens giving a plane wavefront, slit of width a, second lens, screen in its focal plane) and describe the pattern: a broad, bright central maximum with alternate dark bands and much weaker, narrower secondary maxima on both sides. | Diagram | 2 | never | Never asked | |
| 76 | Single slit: conditions for minima and secondary maximaUsing the path difference a sin theta between wavelets from the two edges of the slit, explain by dividing the slit into two (then four, ...) equal parts why minima occur where a sin theta_n = n lambda, and into three (then five, ...) parts why secondary maxima occur near a sin theta_n = (n + 1/2) lambda; say why theta = 0 is the central maximum. | Derivation | 3 | never | Never asked | |
| 77 | Show that R = 2f for a spherical mirrorDraw a ray parallel to the principal axis striking a concave mirror of small aperture, mark the normal through C, use i = r and the isosceles triangle CFM to show PF = PC/2. | Derivation | 2 | never | Not in syllabus | |
| 78 | Resolving power of a compound microscopeDefine limit of resolution and resolving power of a microscope, write the expression, and state how resolving power changes with the wavelength of light, the refractive index of the medium between object and objective, and the semi-angle of the cone of light. | Statement | 1 | never | Not in syllabus | |
| 79 | Double slit with white light: describe the fringesDescribe what replaces the monochromatic pattern when white light is used: a white central fringe with a few coloured fringes on each side (violet edge nearest the centre, red farthest) that soon overlap into general illumination, and give the reason from beta = lambda D/d. | Give reason | 1 | 1 paper | 2026 | Not in syllabus |
| 80 | Numericals: single slit central band width and minimaFrom the wavelength and slit width compute the angle of the first (or nth) minimum and the angular width of the central bright band, and the linear width on the screen when D or the focal length is given. | Numericals | 2 | 1 paper | 2025 improvement | Not in syllabus |
This list was made from the 2027 syllabus and checked with 9 board papers, including the 2027 specimen paper. It is not yet checked with the textbook.
The 10 topics Physics papers ask most
Counted on the board papers from 2018 to the 2027 specimen paper, which every unit has been checked against.
- 1.Numericals: peak, rms, mean, frequency from an ac equationP4 Electromagnetic Induction and Alternating Currents · asked 7 times since 2018
- 2.Uses and special properties of each region (table)P5 Electromagnetic Waves · asked 7 times since 2018
- 3.State Bohr's postulates for the hydrogen atomP8 Atoms and Nuclei · asked 7 times since 2018
- 4.Magnetic force on a moving charge and Lorentz forceP3 Magnetic Effects of Current and Magnetism · asked 6 times since 2018
- 5.Numericals: average power and power factorP4 Electromagnetic Induction and Alternating Currents · asked 6 times since 2018
- 6.Doping, n-type and p-type, donors, acceptors, carriersP9 Electronic Devices · asked 6 times since 2018
- 7.Numericals: two-loop network with two batteries (Kirchhoff)P2 Current Electricity · asked 5 times since 2018
- 8.Derive B at the centre of a circular loopP3 Magnetic Effects of Current and Magnetism · asked 5 times since 2018
- 9.Numericals: B at the centre of a circular coilP3 Magnetic Effects of Current and Magnetism · asked 5 times since 2018
- 10.Ampere's law: derive B near a long straight wireP3 Magnetic Effects of Current and Magnetism · asked 5 times since 2018