Question

objects acts concave convex mirrors in surroundings

Answer 1

CONCAVE
-shaving mirrors in saloons, etc
-small concave mirrors are used by dentists
- used in solar cookers
- used in torches
- used in astronomical telescopes

CONVEX
- used as rear-view mirrors
-used in departmental stores to keep an eye on shoplifters.

Answer 2

Any reflective material can act as a mirror, because it will throw back enough light to form an image of its surroundings. The surface may be a plane, concave or convex. Planar or flat mirrors present a virtual image that reverses the object being reflected. Curved surfaces act more like lenses, without the aberrations to which glass lenses are prone. Nowadays such surfaces can be made from glass, metal, or plastic, often with a thin metal coating. Prisms can also act as mirrors.