Question

Explain how will the power of lens change when its surrounding medium is changed from air to water? Give the condition under which a convex lens will start working as a diverging lens by changing its surrounding medium? Show this phenomenon by drawing a ray diagram

Answer 1

If the refractive index of the liquid is greater than that of the lens then concave lens will turn into convex and convex into concave

Answer 2

If the refractive index of the medium is bigger than the refractive index of a concave lens then the lens becomes a concave lens .

It the refractive index of the surrounding medium is bigger than the concave lens then the lens becomes a convex lens

Convex lens is known as converging lens because it converges light beams at one point