Question

A spherical surface of radius 30cm separates two transparent media A and B with refractive indices 1.33 and 1.48 respectively. The medium A is on the convex side of the surface. Where should a point object be placed in medium A so that the paraxial rays become parallel after refraction at the surface ?

Answer 1

Since, paraxial rays become parallel after refraction i.e. image is formed at ∞.

Object should be placed at a distance of 266 cm from surface (convex) on side A.