Answer :
Spherical mirrors were discovered in the 15th centuries which were in the shape of a curved glass
piece. Many discoveries were done in the part of mirrors. Atlast it
resulted in the mirrors like concave mirrors etc. Such as Spherical
mirrors were a great discovery which still exists with a vast use.
Haytham discussed concave
and convex mirrors in both cylindrical and spherical
geometries, carried out a number of experiments with mirrors, and solved
the problem of finding the point on a convex mirror at which a ray coming from
one point is reflected to another point.