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Physics-

General

Easy

Question

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 then the displacement in the incident and emergent ray will be :

$\frac{t θ (n - 1)}{n}$
$\frac{t θ}{n}$
$\frac{t θ n}{n - 1}$
none

The correct answer is: $fraction numerator t theta n over denominator n minus 1 end fraction$

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