A ray of light is incident on a parallel...

A ray of light is incident on a parallel slab of thickness t and refractive index n. If the angle of incidence `theta` is small, than the lateral displacement in the incident and emergent ray will be

`(t theta(n-1))/(n)`

`(t theta)/(n)`

`(t thetan)/(n-1)`

none of these

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The correct Answer is:

N//a

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