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Question

# A single slit diffraction is obtained using a beam of red light. If red light is replaced by blue light, what happens?

A
The diffraction pattern disappears
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B
There is no change in the diffraction pattern
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C
Diffraction fringes becomes narrower and crowded together
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D
Diffraction fringes become broader and farther apart
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Solution

## The correct option is C Diffraction fringes becomes narrower and crowded togetherFor red light λ=λr ∴βred=Daλr−−−−−(i) For blue light, λ=λb ∴βblue=Daλb−−−−−−(ii) ∴βblueβred=DaλbDaλr=λbλr⇒βblue=λbλr×βred∴λb<λr∴βblue<βred ∴ Diffraction fringes become narrower and crowed together.

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