A) As a enlargement mirror
- When the object is placed less than the focal length of a concave mirror, a larger, upright and virtual image is formed.
B) As a reflector
- When the object is placed at the focal point of a concave mirror, the reflected light rays are parallel and able to produce a strong beam of light.
Concave reflectors are used in car headlights. The bulb of the head light is placed at the focal point of the reflector. The reflected light emerges in a parallel beam and gives more concentrated visibility to the driver at night.
Concave mirrors are used in solar powered gadgets. The parallel rays of the sun are reflected to focus at the focal point F. The solar energy concentrated at F is then used or converted (for example into electrical energy by a solar cell) by the gadget
Look at the mirror! A shinny and smooth surfaced mirror act as a good reflector