Focal length of the plane mirror is

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$\frac{1}{2}$

$\infty$

answer is C.

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Detailed Solution

Focal length of the plane mirror is $\infty$

At the focal length of the mirror is independent of the medium in which it is placed and wavelength of incident light. To a plane mirror, Focal length of the plane mirror is

$\infty$ (or) Radius of curvature of plane mirror $R = α$

$∴ f = \infty$

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