What is the Focal Length of The Plane Mirror?

By Raj Vimal|Updated : July 19th, 2022

The focal length of the plane or planar mirror is infinity. Focal length is defined as the distance between the focus and pole of the mirrors. Normally focal length is considered as the measure of the power of the mirror. It is the distance from a mirror at which parallel light rays will meet.

Important Facts about the Focal length of the Plane Mirror

The relevant points about the focal length of the plane mirror are mentioned below. It will be useful tips for the competitive exams.

  • A plane mirror is basically used to reflect the light.
  • The focal length is infinity in the plane mirror.
  • It means the light rays passing through the mirror never meet at any point.
  • A planar mirror is a spherical mirror of an infinite radius of curvature (R).
  • So focal length is half of the radius of curvature (R/2), and hence it is infinite.
  • Focal length is the measure of distance between the focus and pole of the mirror.

The standard equation of focal length is given below.

  • 1/f =(1/u + 1/v)
  • f = focal length
  • u= object distance
  • v= image distance

Summary:

What is the Focal Length of the Plane Mirror?

Focal length is the term used to define the power of a lens or a mirror. Keep in mind that the focal length of the flat surface mirror is always infinity. That means the distance between focus and poles can’t be defined in the case of plane mirrors.

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What is the Focal Length of The Plane Mirror FAQs

  • A Plane mirror is a flat surface mirror to reflect the light and the focal length of the not curved mirror remains infinity. One side of the flat mirror reflects the light while the other side remains painted.

  • The equation for the focal length is

    1/f =(1/u + 1/v)

    • f = focal length
    • u= object distance
    • v= image distance

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