Question

At what distance from a concave mirror of focal length 25 cm should an object be placed so that the size of image is equal to the size of the object.

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Answer

To get an image of same size the object should be placed at the center of the curvature of a concave mirror.

Given,

focal length = 25 cm

As, centre of curvature = 2 x focal length

Therefore,

centre of curvature

= 2 x 25

= 50 cm

Hence, the object should be kept at 50 cm so that the size of image is equal to the size of object.

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