The optical path difference between two identical light waves arriving at a point is 31.5 λ , where λ is the wavelength of light used. The point is [Given: Two light sources are coherent]

Question

The optical path difference between two identical light waves arriving at a point is 31.5 λ , where λ is the wavelength of light used. The point is [Given: Two light sources are coherent], alternative bright and dark., dark., bright., neither bright nor dark.

MARKS App · Accepted Answer

Path difference Δ x = ( 63 ) 2 λ ​ , which is an odd multiple of the half wavelength. Therefore, it is a dark point or the point of destructive interference.

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