prove that focal length of spherical (concave) mirror is half of its radius of curvature
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r+ r = f
2r = f
r= f÷2
or r = 1/2 of f
2r = f
r= f÷2
or r = 1/2 of 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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