Does focal length of the spherical mirror changes when it is completely immersed in water? Predict and write the reason.

The focal length of concave mirror is f . Is there any change in focal length when it is completely immersed in water ? If not why ?

The ratio of the focal length of spherical mirror to its radius of curvature is

Write any two uses of spherical mirrors.

The focal length of a spherical mirror made of steel is 150 cm. IF the temperature of the mirror increases by 200 K, its focal length become (coefficient of linear expansion of steel alpha=12 times 10^-60 C^-1 )

What happens if focal length of the eye lens does not change ?

The focal length of convex mirror is 16 cm. What is its radius of curvature ?