Spherical Mirror
A curved mirror having a reflective surface shaped like a section of a sphere, classified as concave (converging) or convex (diverging).
Governing formula
1/f = 1/v + 1/u, f = R/2
SI unit
m
In depth
Concave mirrors focus parallel incident rays to a real focal point $f$; convex mirrors cause parallel rays to diverge as if originating from a virtual focus behind the mirror.
Examples in the real world
Concave mirrors used as dentist examination or makeup mirrors; convex mirrors used as wide-angle vehicle side-view mirrors.