If the wavelength of incident light on a concave mirror is increased, how will the focal length of the mirror change ?

If the wavelength of incident light on a concave mirror and convex lens is increased, how will the focal length of each of these change?

If the wavelength of light incident on a convex lens is increased, how will its focal length change?

Focal length of a concave mirror is

Focal length of a concave mirror is

If a concave mirror is held in water, then its focal length

The focal lentht of a concave mirror is

If a concave mirror is immersed in water will its focal length change?

Define focal length of concave mirror.

Radius of curvature of a concave mirror is 24 cm. Then find the focal length of the mirror ?