Question

Define the principle focus of a concave mirror. Write two uses of a convex mirror.

Answer 1

The principle focus of concave mirror is a point on its principle axis to which all the light rays which are parallel and close to the axis, converge after reflection from the mirror.

Uses of convex mirrors:
1) Convex mirrors are used in rear view mirror in vehicles because the mirror can diverge a beam of light and create a virtual image.

2) Convex mirrors are used as reflectors in street lamps to diverge light over a larger area.