What is the focal length of a plane mirror?
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Focal length of a plane mirror is infinity.
(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.)
(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.)
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The focal length of a plane mirror is infinity.
Explanation:
- Focal length is the image which is formed at an infinite distance inside the mirror.
- Plane mirror is considered as the spherical mirror with infinite radius of curvature.
- It is the half the radius of curvature distance and thus is considered as infinity.
- It is considered infinity because although it is at infinite radius of curvature that a plane mirror possess.
- Thus infinity is the focal length.
- It is the radius which is obtained by extending the edges of lens to get a imaginary circle and focal length is the half of the radius.
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