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Syllabus

Interference of Light — Syllabus

ICSE · Class 12 · Physics

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

45 questions34 flashcards12 formulas & key relations5 concepts

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4 Topics · ICSE Class 12 Physics · 2026-27

Topics in Interference of Light

1

1. Principle of Superposition and Interference

  • The principle of superposition states that when two or more waves travel simultaneously in a medium, the resultant displacement at any point is the vector sum of the individual displacements.
  • It holds for all types of waves, except for waves of very large amplitude, such as laser waves.
  • Interference of light is the redistribution of light intensity due to the superposition of two light waves.
2

2. Young's Double-Slit Experiment

  • Thomas Young demonstrated experimentally the interference of light by a double slit in 1801.
  • A narrow slit S is illuminated by monochromatic light and two narrow slits S1 and S2 act as coherent secondary sources.
  • Fringes formed are alternately bright and dark, of equal width, and run parallel to the slits.
3

3. Conditions for Bright and Dark Fringes

  • At maxima, the interfering waves meet in the same phase.
  • At minima, the interfering waves meet in opposite phase.
  • Bright fringes correspond to antinodal lines in the wavelet picture.
4

4. Fringe Width, Intensity, and Energy Conservation

  • All bright fringes in monochromatic YDSE have equal intensity when the two slits contribute equal amplitudes.
  • All dark fringes have zero intensity when the two amplitudes are equal.
  • Fringe width does not depend on fringe order.

Key Concepts

Central concept: Interference of light as the redistribution of intensity caused by superposition of coherent light waves

Principle of superpositionInterferenceYoung's double-slit experimentCoherent sourcesInterference patternConditions for maxima and minimaFringe widthAngular fringe width

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Frequently Asked Questions

What are the important topics in Interference of Light for ICSE Class 12 Physics?
Key topics in Interference of Light include Principle of Superposition and Interference, Young's Double-Slit Experiment, Conditions for Bright and Dark Fringes, Fringe Width, Intensity, and Energy Conservation. Study these first, then practise questions on each for the ICSE Class 12 board exam.
How should I revise Interference of Light for the ICSE Class 12 board exam?
Learn the core ideas first, then work through the 45 practice questions on Interference 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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