What are the values of radius of curvature and focal length of a plane mirror?
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When
an object is placed infront of a plane-mirror an image is formed behind
the mirror at a distance equal to the distance of the object from the
mirror.That is distance of the image from the mirror= V = -U.
from the law of distances, 1/f = 1/U + 1/V
1/f = 1/U - 1/U = 0
That is f = infinity. (Where f is the focal length of the mirror,U is distance of the object from the mirror,and V is the distance of the image from the mirror .)
R = 2 X f
from the law of distances, 1/f = 1/U + 1/V
1/f = 1/U - 1/U = 0
That is f = infinity. (Where f is the focal length of the mirror,U is distance of the object from the mirror,and V is the distance of the image from the mirror .)
R = 2 X f
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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.
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