The distance of principle focus from optic center is called focal length of a concave lens.
venky
10 Years ago
A spherical mirror is a mirror which has the shape of a piece cut out of a sphericalsurface. There are two types of spherical mirrors: concave, and convex.
PRAPULPODISHETTI
10 Years ago
A mirror which is a part of a sphere is called Spherical Mirror.
E.Nandhini ketha
8 Years ago
A spherical mirror is simply a piece cut out of a reflective sphere. Spherical mirror is of two types concave mirro and convex mirror.