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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 the front of the concave mirror so as obtain an image which is real, inverted and same size as the object?

A

14 cm

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B

34 cm

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C

28 cm

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D

20 cm

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Solution

The correct option is C 28 cm
When the image formed by a concave mirror is real, inverted and of same size, the object must be be placed at centre of curvature. The centre of curvature is at a distance 2f.
Given, f = 14 cm
2f = 2 x 14 cm
= 28 cm

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