A concave mirror of focal length `f` in vacuum is placed in a medium of refractive index 2. its focal length in the medium is

Assertion : The radius of curvature of a mirror is double of the focal length. Reason : A concave mirror of focal length f in air is used in a medium of refractive index 2. Then the focal length of mirror in medium becomes 2f.

Assertion : The radius of curvature of a mirror is double of the focal length. Reason : A concave mirror of focal length f in air is used in a medium of refractive index 2. Then the focal length of mirror in medium becomes 2f.

Assertion : A concave mirror of focal length f in air is used in a medium of refractive index 2. Then the focal length of mirror in medium becomes double. Reason: The radius of curvature of a mirror is double of the focal length.

A convex lens of focal length .f is placed in a medium of refractive index equal to that of lens What happens to its focal length?

A thin lens of refractive index 1.5 has focal length of 15 cm in air. When the lens is placed is a medium of refractive index (4)/(3), its focal length will become …..cm.

A thin lens of refractive index 1.5 has focal length of 15 cm in air. When the lens is placed is a medium of refractive index (4)/(3), its focal length will become …..cm.

A lens made from a material of absolute refractive index n_1 is placed in a medium of absolute refractive index n_2 . The focal length f of the lens is related to n_1 and n_2 as :