# The focal length of a plane mirror is

The focal length of a plane mirror is infinity.

Before letting know about the focal length of plane mirrors we will know what are plane mirrors?

Plane mirrors – The images formed from plane mirrors are the reflected images in their normal proportions but reversed from left to right. These are the most widely used mirrors.

### Focal length

The focal length of a plane mirror is infinity as the image can be formed at an infinite distance inside the mirror. A plane mirror can be recognised as a spherical mirror of infinite radius of curvature. Focal length is half of the radius of curvature and hence it is infinity.

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