Question

Define the principle focus of a concave mirror.

Answer 1

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.