MHT CET 2022 Physics question

A diffraction pattern is obtained by making blue light incident on a narrow slit. If blue light is replaced by red light then

(A)there is no change in diffraction pattern
(B)diffraction bands disappear
(C)diffraction bands become narrower
(D)diffraction bands become broaderCorrect

Answer: (D)

Solution

In single-slit diffraction the angular width of the central maximum is , and the width of the bands (on a screen at distance ) is proportional to the wavelength: . Red light has a longer wavelength ( nm) than blue light ( nm), so

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Question ID VK-093784