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Consider a ray of light incident from ai...

Consider a ray of light incident from air onto a slab of glass (reffractive index n) of width d , at an angle `theta` . The phase difference between the ray reflected by the top surface of the glass and the bottom surface is ,

A

`(4pid)/lambda[1 -1/n^2 sin^2 theta ]^(1/2)+pi`

B

`(4pid)/lambda[1 -1/n^2 sin^2 theta ]^(1/2)`

C

`(4pid)/lambda[1 -1/n^2 sin^2 theta ]^(1/2)+pi/2`

D

`(4pid)/lambda[1 -1/n^2 sin^2 theta ]^(1/2)+2pi`

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