A ray of light is incident on a parallel slab of thickness and refractive index

PHYSICS · Single correct · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction

Problem

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: (a)

\frac{t\theta(n-1)}{n}

(b)

\frac{t\theta}{n}

(c)

\frac{t\theta n}{n-1}

(d) none