A virtual, erect and magnified image of an object is to be produced with a concave mirror of focal length $12 cm .$ At what distance the object must be placed?

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10 cm

15 cm

20 cm

25 cm

answer is A.

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Detailed Solution

A virtual, erect and enlarged image of an object is to be produced with a concave mirror of a focal length of

12 cm

. The object must be placed at a distance of

10 cm .

We know that if the object is placed between the pole and the focus of the concave mirror, then the image formed is virtual, erect, and magnified. So the object is placed at a distance less than the focal length (less than

12 cm

). And only

10

in options is less than

12

. So the answer is

10

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A virtual, erect and magnified image of an object is to be produced with a concave mirror of focal length 12 cm. At what distance the object must be placed?