Question

an object is placed 20 cm from a concave mirror of focal length 20 cm the distance of the image from the pole of the mirror is

Answer 1

when an object is at focus , image is formed at infinity which can be seen in solving the sum and finding the distance between image and pole.

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Answer 2

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.