MHT CET 2024 Physics question

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

(A)no change in diffraction pattern
(B)diffraction bands become narrow and crowded togetherCorrect
(C)diffraction bands become broader and father apart
(D)bands disappear

Answer: (B)

Solution

In single-slit diffraction the width of the bands (angular position of minima) is , so the band width is proportional to the wavelength . Blue light has a shorter wavelength than red light ( nm, nm),

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Question ID VK-092565