Optics Question 228

Question: A parallel beam of monochromatic light of wavelength 5000AA is incident normally on a single narrow slit of width 0.001 mm. The light is focused by a convex lens on a screen placed on the focal plane. The first minimum will be formed for the angle of diffraction equal to

[CBSE PMT 1993]

Options:

A) 0∘

B) 15∘

C) 30∘

D) 60∘

Show Answer

Answer:

Correct Answer: C

Solution:

For the first minima dsin⁡θ=λ

⇒ sin⁡θ=λd⇒

θ=sin−1(5000×10−100.001×10−3)=30o

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