Question

what is gravitational lens

Answer 1

hey mate here is it answer a region of space containing a massive object whose gravitational field distorts electromagnetic radiation passing through it in a similar way to a lens, sometimes producing a multiple image of a remote object.

Answer 2

A gravitational lens is a distribution of matter between a distant light source and an observe that is capable of bending the light from the source as the lighting travel towards the observer.This effect is known as gravitaional lens
Hope its helpful to you.