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Question 20223
JEE Physics · Medium

Electromagnetic Waves and Wave Optics: Diffraction Grating Condition MCQ

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Diffraction Grating ConditionMediumQuestion 20223

Question

Diffraction grating condition for maxima (grating spacing d, angle θ, wavelength λ) is:
  1. A
    d sinθ = nλ
    Correct
  2. B
    d cosθ = nλ
  3. C
    d tanθ = nλ
  4. D
    2d sinθ = nλ

Correct answer

d sinθ = nλ

Explanation

For a diffraction grating with N slits separated by d: constructive interference at d sinθ = nλ (n = 0, ±1, ±2, ...). More slits → sharper maxima. Used for precision wavelength measurement.

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