A lens which has two spherical surfaces both bulging inside is called ___.
concave lens
convex lens
plano-convex lens
plano-concave lens
A lens having two spherical surfaces both bulging inside is called a concave lens.
A spherical mirror and a spherical lens each have a focal length of, -15 cm. The mirror and the lens are likely to be : (a) both concave. (b) both convex. (c) the mirror is concave but the lens is convex. (d) the mirror is convex but the lens is concave.