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Question 20208
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Electromagnetic Waves and Wave Optics: YDSE — Effect of Immersion in Water MCQ

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YDSE — Effect of Immersion in WaterMediumQuestion 20208

Question

YDSE is performed in water (refractive index 4/3). Fringe width compared to air is:
  1. A
    4/3 times larger
  2. B
    3/4 times smaller
    Correct
  3. C
    Unchanged
  4. D
    16/9 times larger

Correct answer

3/4 times smaller

Explanation

In water, λ_water = λ_air/n. Fringe width β = λD/d → β_water = (λ/n)D/d = β_air/n = (3/4)β_air.

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