An object is placed at distance of 10 cm from the focus of a concave mirror and the image fromed at 40 cm from the focus. The focal length of mirror is
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30 cm is the focal length of the mirror
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The distance between the pole P of the concave mirror and the focus F 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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