How do you find the focal length of a concave mirror
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focal length = radius of curvature/2
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Focal length (f) = Radius of curvature (R) / 2 .
(or)
Radius of curvature (R) = 2 × Focal length (f) .
(or)
Radius of curvature (R) = 2 × Focal length (f) .
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