Question

Define the principal focus of a concave mirror. Write the uses of a convex mirror.

Answer 1

Principal focus of a concave mirror:

1. The principal focus of a concave mirror is a point on the principal axis at which a light ray parallel to the principal axis converges after reflection.
2. Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror. This point is known as the principal focus of the concave mirror.
3. It is denoted by F.

Uses of the convex mirror:

1. It is used inside buildings such as large offices, stores, and hospitals to see people around the corner so as to avoid accidents.
2. It is used as a rear-view mirror in vehicles and automobiles.
3. It is used for security purposes in many places such as ATMs.