Focal lenght of plane mirror is half of the radius and radius of plane mirror is 0. Therefore focal length is infinity
A plane mirror can be considered to be the limit of either a concave or a convex spherical curved mirror as the radius, and therefore the focal length, becomes infinite.
Distance between the focus and pole . It is half of radius

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No prblm
Thnkew..
Also infinite
Answer given
And what is radius of curvature for plane mirror
Boz f = r/2 but in a plane mirror r is at infinity so f is infinite
Infinite
infinite
Infinity shyd

A plane mirror can be considered as a spherical mirror of infinite radius of curvature. Focal length is half of radius of curvature and hence it is infinity. You can use the mirror formula also to get the focal length of a plane mirror, where the image distance = − object distance