Question

what is the history of spherical mirrors in human civilization?

Answer 1

one of the earliest examples is from the Greek scholar, Archimedes, who burnt the enemy ships with the help of parabolic mirrors.
spherical mirrors are fine for work where the incoming rays are not parallel. reflectors in lamp housings, for shaving mirrors, in catadiaoptic telescopes etc. are examples for the use of spherical mirrors in human civilization.