Question

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

Answer 1

The object should be placed at the centre of curvature
i.e, at 2(focal length)
= 25*2
= 50 cm

Answer 2

The object should be placed at the center of curvature i.e.

2×Focal length

= 2×25

= 50cm

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