Question

For plane mirror value of magnification m = 1 then its focal length f =

Answer 1

infinity focal length of plane mirrors

Answer 2

Given that,

Magnification of plane mirror, m = 1

To find,

The focal length of plane mirror.

Solution,

• The focal length of the plane mirror is given in terms of radius of curvature as :

R = 2 f, f is focal length

• A plane mirror can be considered as a spherical mirror of infinite radius of curvature.
• So, the focal length of the plane mirror is infinite.

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For plane mirror value of magnification m = 1 then its focal length f is?

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