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Question

A concave mirror of focal length 20cm produces an image twice the size of the object. If the image is real, then the distance of the object from the mirror is

A
20 cm
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B
10 cm
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C
30 cm
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D
60 cm
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Solution

The correct option is C 30 cm
The magnification produced by the mirror is given as
m=vu=2 v=2u
From mirror formula
1v+1u=1f12u+1u=12032u=120u=30 cm
Therefore, the object is at a distance of 30 cm from the mirror
Therefore, Option C is correct.

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