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Syllabus

Diffraction of Light — Syllabus

ICSE · Class 12 · Physics

What Diffraction of Light covers in ICSE Class 12 Physics: 4 topics, for the 2026-27 session. Part of the ICSE Class 12 Physics syllabus.

45 questions28 flashcards8 formulas & key relations5 concepts

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4 Topics · ICSE Class 12 Physics · 2026-27

Topics in Diffraction of Light

1

1. Core idea of diffraction

  • Light travels approximately in straight lines when obstacles or apertures are large.
  • When the obstacle or aperture size becomes comparable to the wavelength, light bends round the corners and enters the geometrical shadow.
  • The intensity distribution on the screen due to an aperture is called the diffraction pattern.
2

2. Fraunhofer diffraction at a single slit

  • A narrow slit of width e is illuminated by monochromatic light normally.
  • A convex lens can focus the diffracted light on a screen placed in its focal plane.
  • Placing the source at the focus of a convex lens produces a plane wavefront and satisfies the Fraunhofer condition.
3

3. Important limiting cases and observations

  • When the slit is narrowed, the angle \u03b8 increases and the central maximum becomes wider.
  • If slit width e equals wavelength \u03bb, the first minimum occurs at \u03b8=90\u00b0, so the central maximum fills the whole space.
  • If the slit width is increased sufficiently, diffraction nearly vanishes and light propagates approximately rectilinearly.
4

4. Comparison with interference

  • Interference is due to superposition of light waves coming from two coherent sources.
  • Diffraction is due to interference of secondary wavelets coming from different points of the same wavefront.
  • Both interference and diffraction demonstrate the wave nature of light.

Key Concepts

Central concept: Diffraction of Light

Nature of diffractionCondition for diffractionSingle-slit Fraunhofer diffractionDiffraction patternPrincipal maximumMinimaSubsidiary maximaAngular and linear width

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Frequently Asked Questions

What are the important topics in Diffraction of Light for ICSE Class 12 Physics?
Key topics in Diffraction of Light include Core idea of diffraction, Fraunhofer diffraction at a single slit, Important limiting cases and observations, Comparison with interference. Study these first, then practise questions on each for the ICSE Class 12 board exam.
How should I revise Diffraction of Light for the ICSE Class 12 board exam?
Learn the core ideas first, then work through the 45 practice questions on Diffraction of Light. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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