The focal length of the plane mirror is ____.

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Detailed Solution

The focal length of the plane mirror is infinite.
A plain mirror is a infinity spherical mirror and then it has radius of curvature infinite, then the focal length is also infinite

F = 2 R

F

is focal length and

R

is the radius of curvature of a spherical mirror.
It is possible to assign the plane mirror an infinite focal length. The parallel beams that are reflected through a plane mirror and then reunite at infinity have a focal length of infinity.

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