Question

Which kind of mirror is used in the headlights of a car ? Why is it used for this purpose ?

Answer 1

A concave mirror is used in the headlight of a car. The reason being that a concave mirror is a converging mirror. In headlights the bulb is kept at the focus of the mirror. we see from the above ray diagram that the rays emanating from the bulb after reflection from the mirror become parallel to the principal axis. This actually creates a powerful beam of light as the diverging rays are collected and converged into a beam