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Question

Why the focal length of a plane mirror is infinite?

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Solution

Plane mirror is formed with plane surface so it’s curvature is 0 and radius of curvature is infinite.
f=R/2
f= infinite /2
f= infinite.

Also so position of image and position of object is equal
1/f = 1/v +1/u
1/f = 1/x-1/x
1/f = 0
f = 1/0 = infinite.

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