Define focal length and radius of curvature of a spherical mirror.Deduce the relation between them.

Define a spherical mirror.

Define focus, focal length and aperture of a spherical mirror.

Define focal length of a lens

Define the focal length of mirror

What is the relation between focal length and radius of curvature of a concave mirror? What is focal length of a plane mirror?

The radius of curvature of a spherical mirror is 20cm.What is its focal length?

By stating the sign conventions and assumptions used, derive the relation between distance of object, distance of image and radius of curvature of convex spherical surfaces, when refraction takes from optically rarer to optically denser medium.