with a concave mirror and object is placed at a distance X1 from the principal focus on the principal Axis . the image is formed at a distance X2 from the principal focus. the focal length of the mirror is
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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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