Define focal length and radius of curvature of a concave lens.

How would you determine the focal length and radius of curvature of a concave mirror?

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

a) An object is kept between centre of curvature and principal focus of a concave mirror. Write the nature of the image formed. b) Define focal length of a convex mirror. Write the relationship between focal length and radius of curvature of a convex mirror.

Define focal length of a mirror and hence relate focal length and radius of curvature of a mirror.

What is the relation between the focal length and radius of curvature of a spherical mirror (concave mirror or convex mirror ) ? Calculate the focal length of a sphrical mirror whose radius of curvature is 25 cm.