(a) Convex mirrors are used as rear view mirrors in vehicles. It is due to the reason that convex mirrors produce an erect image of object and image formed in convex mirror is much smaller in size than the object due to which driver is able to see large area behind him and drive carefully.

(b) Concave mirrors are used as reflectors in search-light because when a light is placed at focus of concave reflector then it produces powerful beam of parallel rays, by which we can see things even in very dark.