Question

what changes in focal length when a mirror is dip into water??​

Answer 1

Hii mate

The focal length of a lens is very much affected when immersed in water. The reason is that the angle of refraction is dependent on the relative difference between the indices of refraction of the incoming medium and the medium of the lens. ... Your eyes' focal length change dramatically

thanks

Answer 2

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. Therefore, when a convex lens is dipped into water, its focal length increases.

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