Q49 / 222 · NTA Abhyas (NEET) 2020 · Physics · Wave Optics

In a Fraunhofer diffraction at a single slit, if yellow light illuminating slit is replaced by blue light, then diffraction bands

A
Remain unchanged
B
Become wider
C
Disappear
Correct answer
D
Become narrower

Solution

Bandwidth

\propto λ

λ_{b l u e} < λ_{y e l l o w} \Rightarrow

Bandwidth becomes narrower when yellow light is replaced by blue light.

Hence, the correct answer is option: 'D'.

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