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Question

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

A

12.5 cm

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B

25 cm

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C

50 cm

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D

At infinity

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Solution

## The correct option is C 50 cm When the object is placed at C, an image of equal size is formed at C but is inverted. It is given that f = 25 cm. C = 2f ∴ C = 50 cm. Thus, when the object is placed at C, an inverted image of the same size is formed at C as well. Hence, the object must be placed at a distance of 50cm from the concave mirror.

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