Focal length of a plane mirror is__?

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zero

-25

infinite

answer is D.

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Detailed Solution

The focal length of a plane mirror is infinite.
A plane mirror is a flat reflecting surface. When a parallel ray of light strikes the mirror, they get reflected back parallel to each other. Since they are parallel lines, they never meet each other. The curvature of the plane mirror is zero, so the radius of curvature is infinite, and the centre of curvature of the plane mirror also exists at infinite.

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