Question

A concave mirror and a convex lens are held in water. what changes ,if any ,do you expact in their focal lengths​

Answer 1

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The focal lens of both mirror & lens would increase,as the light rays would converge at a farther point than the principle focus in air.This is due to d change in refractive index i.e ,it is greater for water.

Answer 2

Answer:

Focal length of any mirror (concave) does not depend on medium, so it remains unchanged.  If refractive index of the material of convex lens is greater than that of water, then its focal length will increase. If refractive index of the material of convex lens is equal to that of water, then its focal length will become infinity. If refractive index of the material of convex lens is less than that of water, then its focal length will become negative i.e it will behave like concave lens.

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