Assertion:- Paraxial rays are always parallel to the principal axis.
Reason:- A parallel beam parallel to principal axis converges at the focal point.

Statement-1: Paraxial rays are always parallel to the axis of a mirror or lens. Statement-2: A parallel beam close to principal axis converges at the focal point.

Rays Not Parallel To Principle Axis

What happens to a ray travelling parallel to the principal axis ?

Where will the rays coming parallel to the principal axis coverage ?

A ray of light is incident on a concave mirror . It is parallel to the principal axis and its height from principal axis is equal to the focal length of the mirror. The ratio of the distance of point B to the distance of the focus from the centre of curvature is (AB is the reflected ray)

A ray of light is incident on a concave mirror . It is parallel to the principal axis and its height from principal axis is equal to the focal length of the mirror. The ratio of the distance of point B to the distance of the focus from the centre of curvature is (AB is the reflected ray)

A ray of light is incident on a concave mirror . It is parallel to the principal axis and its height from principal axis is equal to the focal length of the mirror. The ratio of the distance of point B to the distance of the focus from the centre of curvature is (AB is the reflected ray)

Draw the ray diagrams showing incident ray and reflected ray for (1) a ray parallel to the principal axis and (2) a ray passing through the principal focus of a concave mirror.