Question

a concave mirror and a converging lens have the same focal length in air. which one of the two will have greater focal length when both are immersed in water?

Answer 1

concave mirror supposed have X length and convex lens have Y length when it immerged in water there is no change in focal length of them for a particular point because medium cannot make effect on there length

Answer 2

Answer:

the above answer is same which I wanted to give you