MHT CET 2022 Physics question

Physics Wave Optics MHT CET 2022

The optical path difference between two identical light waves arriving at a point is , where '' is the wavelength of light used. The point is [Two light source are coherent]

(A)alternatively bright and dark
(B)darkCorrect
(C)bright
(D)neither bright nor dark

Answer: (B)

Solution

For coherent sources, constructive interference (bright) occurs when the path difference is an integral multiple of (), and destructive interference (dark) when it is an odd multiple of , i.e. . Here $31.5λ = (31 +

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Question ID VK-093953