A glass wedge with a small angle of refraction `theta` is placed at a certain distance from a converging lens with a focal length f ,one surface of the wedge being perpendicular to the optical axis of the lens. A point sources S of light is on the other side of the lens at its focus. The rays reflected from the wedge (not from base) produce, after refraction in the lens , two images of the source displaced with respect to each other by d. Find the refractive index of the wedge glass. [Consider only paraxial rays.]

Answer

`(d)/(2ftheta)`

Explanation

Now `(2mutheta)f = d implies mu = (d)/(2thetaf)`