Define the Principle Focus of a Concave Mirror and Uses of a Convex Mirror

The principle focus of a concave mirror is the point on its principal axis where parallel rays of light, after reflection, converge or appear to converge. A convex mirror, on the other hand, is mainly used for safety and wide-angle viewing.

Principle Focus of Concave Mirror

• Parallel rays of light incident on a concave mirror converge at a point on the principal axis.
• This point is called the principal focus (F).
• The distance between the mirror’s pole and the focus is called the focal length.

Uses of Convex Mirror

1. Vehicle Mirrors: Used as rear-view mirrors because they provide a wider field of view.
2. Security Mirrors: Installed in shops, parking areas, and ATMs for surveillance.
3. Road Safety: Placed at blind curves to help drivers see oncoming vehicles.

Thus, concave mirrors focus light, while convex mirrors help in safe and wide viewing.