Q143 / 160 · AP EAMCET 2023 (16 May Shift 2) · Physics

A diffraction pattern is obtained by using a beam of red light. If the red light is replaced by the blue light

Correct answer
A
bands will be narrower
B
bands become broader
C
no change in the width of the bands takes place
D
bands disappear

Solution

The width of the fringe in diffraction, $\beta=\frac{D \lambda}{d}$ Hence, when the red light is replaced by blue light, the wavelength decreases which means that the fringe width decreases and band will be narrower.

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

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