Is it true that the focal length of a plane mirror is zero?

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True

False

answer is B.

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Detailed Solution

The above statement is False.
A plane mirror has an infinitely long focal length. A plane mirror is equivalent to a spherical mirror with an infinite radius of curvature. The focal length (

f

) of a mirror is defined as half the radius of curvature (

R

Focal Length (f) = (1 / 2) \times radius of curvature of the spherical mirror (R) .

The correct statement would be, the focal length of a plane mirror is infinite.

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