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Q.

The focal length of the plane mirror is


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a

At infinity

b

Zero

c

Negative

d

None of these 

answer is A.

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Detailed Solution

The focal length of the plane mirror is at infinity.
In contrast to a spherical mirror, which is part of a sphere with a fixed radius, a plane mirror is part of an infinite sphere. A plane mirror is a flat reflecting surface. As a result, when parallel rays of light strike a plane mirror, they are reflected parallel to each other. So they never meet, or they meet at infinity. As a result, the plane mirror's focal length is infinite. Because the focal length of a mirror is half its radius of curvature, the focal length of a plane mirror is also infinity.
 
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