Question

Write the rules used for drawing ray diagrams for the formation of an image by a concave mirror.

Answer 1

The rules used for drawing ray diagrams for the formation of an image by a concave mirror are:
Rule 1: If the incident ray is parallel to the principal axis then the reflected ray passes through the focus of the concave mirror.
Rule 2: If the incident ray passes through the focus of the concave mirror, the reflected ray is parallel to the principle axis.
Rule 3: If the incident ray passes through the centre of curvature of the concave mirror, the reflected ray traces the same path.