What will be the sign convention for focal length of a concave mirror whenobject placed in between focus n pole?
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Concave mirror's focal length is always negative.
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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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