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Question

An object is present on the principal axis of a concave mirror at a distance 30 cm from it. Focal length of mirror is 20 cm. Image formed by mirror is :

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A
at a distance 60 cm in front of mirror
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B
at a distance 60 cm behind the mirror
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C
at a distance 12 cm in front of mirror
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D
at a distance 12 cm behind the mirror
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Solution

The correct option is A at a distance 60 cm in front of mirror
Object distance u=30 cm

Focal length of the mirror f=20 cm

Using mirror formula 1v+1u=1f

1v+130=120

v=(30)(20)30+20=60 cm

Since image distance comes out to be negative, thus image is formed in front of the mirror at a distance of 60 cm.

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