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Question 20235
JEE Physics · Medium

Electromagnetic Waves and Wave Optics: Diffraction — Slit vs Grating MCQ

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Diffraction — Slit vs GratingMediumQuestion 20235

Question

Compared to a double slit, a diffraction grating with many slits produces:
  1. A
    Fewer maxima but at same positions
  2. B
    Sharper, brighter maxima at the same angular positions
    Correct
  3. C
    Maxima at different positions
  4. D
    No interference pattern

Correct answer

Sharper, brighter maxima at the same angular positions

Explanation

All N slits of a grating separated by d produce maxima at the same angles d sinθ = nλ. But with N slits, the maxima are N times narrower (sharper) and N² times brighter. Gratings are used for high-resolution spectroscopy.

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