1.)One of the earliest famous examples is from the greek Archimedes, who burnt ships with parabolic mirrors. 
2.)Spherical mirrors are fine for work where the incoming rays are not parallel.   Reflectors in lamp housings, for shaving mirrors, in catadiaoptic (Schmidt) telescopes are some.

these are some examples of history of spherical mirrors in human civilisation...

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This answer is even given in our textbook we should also have extra info
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