Question

what happen if a converging lens and a converging mirror is dipped in a medium of same refractive index as of the lens?​

Answer 1

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 .if refractive index of a material of concave lens is equal to water , then its focal length will become infinity if refractive index of a material is less than water than it behaves like a concave lens
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