MHT CET 2022 Physics question

The path difference between two interfering light waves meeting at a point on the screen is . The band obtained at that point is

(A) bright band
(B) dark bandCorrect
(C) dark band
(D) bright band

Answer: (B)

Solution

The path difference is , an odd multiple of , so the point is a dark band (bright bands need an integral multiple of ). For the th dark band the path difference is . Equating,

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Question ID VK-093646