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Q.

Light reaches at a point P via two different paths(i) Direct (ii) After reflection from a plane mirror. Path difference between the two  path is 5λ2 , then the intensity at point P in terms of intensity due to source of light (I) is

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a

2I

b

0

c

I

d

4I

answer is D.

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Detailed Solution

Optical path difference when light directly comes = 5λ2Path difference when light comes after reflection  =5λ2+λ2=6λ2⇒even  multiple  of  λ2 so phase difference is 0 or 2πIR=4Icos2ϕ2, IR=4I
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