MHT CET 2025 Physics question

If the two sources of light emit waves of different amplitudes and interfere then

(A)there is some intensity of light in the region of destructive interferenceCorrect
(B)fringe width is less
(C)brightness of fringes is less
(D)fringes disappear after short time

Answer: (A)

Solution

For two coherent waves of amplitudes and , and . If , then , so the dark fringes are not perfectly dark: there is some light even in the regions of destructive interference, option (A). Fringe width $β =

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Question ID VK-102801