Question

The refractive index of a material of a convex lens is n₁. It is immersed in a medium of refractive index n₂ parallel beam of light is incident on the lens. Trace the path of the emergent rays when n₂>n₁

Answer 1

it is given that, refractive index of a material of a convex lens is $n_1$.

refractive index of medium in which lens is immersed = $n_2$

as it is given that, $n_2>n_1$, e.g., refractive index of medium is greater than refractive index of lens then, a converging lens {e.g., convex lens } behaves as diverging lens.

hence, a parallel beam of light incident on it will diverge.