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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 (refractive index n) of width d, at 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^2sin^2theta)^(1/2)+pi`

B

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

C

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

D

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

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