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Question

In Fraunhoffer diffraction experiment, L is the distance between screen and the obstacle, b is the size of obstacle and λ is wavelength of incident light. The general condition for the applicability of Fraunhoffer diffraction is :

A
b2Lλ>>1
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B
b2Lλ=1
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C
b2Lλ<<1
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D
b2Lλ1
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Solution

The correct option is B b2Lλ<<1
Fraunhoffer diffraction occurs when,
b2λ<<Lb2Lλ<<1
Option C is correct.

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