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Image Formation by Lenses

A concave mir...

Question

A concave mirror has a focal length of 14 cm. Where should an object be placed in front of this mirror to obtain an image that is real, inverted, and of the same size as the object?

A

14 cm

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B

28 cm

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C

20 cm

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D

42 cm

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Solution

The correct option is B 28 cm
The image of an object placed at the C of a concave mirror is formed at C.
Distance of C from pole, R = 2f = 2 x (–14) = –28 cm

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