Define focal length. What is the focal length of plane mirror, concave mirror and convex mirror?

Sunil Bhardwaj

The distance between the principal focus of a mirror and the pole of mirror is called focal length of the mirror.

In case of Concave mirror distance between the pole O and principal focus F of mirror is focal length and is always taken as negative.

In case of Convex mirror distance between the pole O and principal focus F of mirror is focal length and is always taken as positive.

The radius of Curvature of plane mirror is infinite, hence the focal length of plane mirror will also be infinite.

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