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Question

# An object is kept at 15cm from a convex mirror of focal length 25cm. Calculate the image distance.

A
9.37cm behind the mirror
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B
9.3cm in front of the mirror
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C
Insufficient data
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D
15cm behind the mirror
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Solution

## The correct option is A 9.37cm behind the mirrorGiven: An object is kept at 15cm from a convex mirror of focal length 25cm.To find the image distanceSolution:according to the question,object distance , u=−15cm, focal length, f=25cmBy the mirror formula 1f=1v+1u125=1v−115⟹1v=125+115⟹1v=3+575⟹v=758⟹v=9.37cmHence the image distance is 9.37cm behind the mirror.

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