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Draw ray diagram to show the principal focus of a:
(i) concave mirror
(ii) convex mirror
(i) concave mirror
Whenever light rays from a source are parallel to the principal axis of a concave mirror, they all converge at a single point after reflection.
This point is called 'Principal focus'. The principal focus is denoted by the letter F
(ii) convex mirror:
Whenever light rays from a source are parallel to the principal axis of a convex mirror, after reflection, the rays appear to diverge from a single point called the principal focus of convex mirror.
Updated on: 10-Oct-2022
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