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A ray of light is incident on a parallel slab of thickness $f$ and refractive index $n .$ If the angle of incidence $θ$ is small , then the displacement in then incident and emergent ray will be:
$\frac{t θ (n - 1)}{n}$
$\frac{10}{n}$
$\frac{t θ n}{n - 1}$
none

A

\frac{10}{n}

B

\frac{t θ n}{n - 1}

C

\frac{t θ (n - 1)}{n}

D

none

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