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In a Young's double slit experiment the ...

In a Young's double slit experiment the amplitudes of the two waves incident on the two slits are `A` and `2A`. If `I_(0)` is the maximum intensity, then the intensity at a spot on the screen where the phase difference between the two interfering waves is `phi` .

A

`I_0cos^2(phi//2)`

B

`I_0/3sin^2(phi//2)`

C

`I_0/9(5+4cosphi)`

D

`I_0/9(5+8cosphi)`

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