Question

A concave mirror and convex lens are held in water. What change, if any, do you
expect to find in the focal length of either?​

Answer 1

Answer:

Focal length of any mirror [ concave ] does not depends on medium , so it remains unchanged . if refractive index of a material of convex lens is greater than of water , then its focal length will increase .

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Answer 2

Answer:

Focal length of mirror doesn't change with medium whereas focal length of convex lens will change if kept in water