Making a common observation in your surrounding list the uses of spherical mirrors (a)concave (b)convex

A) common uses of concave mirrors:
concave mirrors are used in vehicle headlights to send parallel  rays to focus the light rays as a single beam, in reflectors of flashlights for the same purpose, in satellite dishes, in personal mirrors at homes (e.g. shaving mirrors to see clearer).
b)common uses of convex mirrors:
convex mirrors are used as side view mirrors in cars. they are also used in camera phones.

Answerthe number of protons in an atom is its atomic number