With the help of a diagram explain the focal length of a concave mirror.
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Focal Length - The distance between the P(pole) of the concave mirror and the F(focus) is the focal length of the concave mirror. Thus, the focal length of a concave mirror can be estimated by obtaining a 'Real image' of a distant object at its focus, as shown in the figure.
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In other words, in the small-angle approximation, the focal length f of a concave spherical mirror is half of its radius of curvature, R: f=R2
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