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Q.

If intensity of each wave in the observed interference pattern in Young’s double slit experiment is I0 ,then for some point P where the phase difference is ϕ, intensity I will be  

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a

I=I0cos2ϕ

b

I=I0cosϕ

c

I=I0(1+cosϕ)

d

I=2I0(1+cosϕ)

answer is D.

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Detailed Solution

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I=I1+I2+2I1I2cosϕ IR=I0+I0+2I0I0cosϕ IR=2I0(1+cosϕ)

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