Question

explain how focal length of mirror is independent​

Answer 1

Explanation :

The focal length of the concave mirror does not change when it is immersed in water because focal length of a mirror does not depend upon the refractive index of the medium. Refractive index of glass with respect to water is greater than refractive index of glass with respect to air.

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Answer 2

Answer:

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the focal length of the mirror remains same as in work on the principle of reflection and Reflection is independent on the

however in is in the case of lens the principle is that of refraction