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# Define focus of a concave mirror and a convex mirror

Discussion in 'CBSE Class 10 Physics Help' started by Vinila Choudary, Jan 19, 2012.

1. ### Vinila ChoudaryActive Member

• For a concave mirror. The rays traveling parallel to the principal axis of a mirror after reflection pass through (converge at) a point F This point F is known as the principal focus of the concave mirror. It is a real point in front of a mirror.
• For a convex mirror. The rays traveling parallel to the principal axis of a mirror after reflection appear to diverge from a point F on the principal axis. This point F is known as the principal focus of the convex mirror. It is a virtual point, i.e., behind the mirror.