Question

What is the focal length of a plane mirror?

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Solution

The focal length of a plane mirror.The focal length of a plane mirror is infinity because parallel rays that meet after reflection via a plane mirror meet again at infinity.A plane mirror has an unlimited focal length since it is a spherical mirror with an infinite radius of curvature. We already know that focal length equals half the radius of curvature. As a result, the plane mirror's focal length is limitless. Hence, the focal length of the plane mirror is infinite.

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