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Question

An object 20 cm from a convex mirror give rise to a virtual image 15 cm behind the mirror. The focal length of the mirror is



Your Answer
A

8.5 cm

Your Answer
B

30 cm

Your Answer
C

 90 cm

Correct Answer
D

 60 cm


Solution

The correct option is D

 60 cm


Taking new Cartesian sign conventions 1u+1v=1f120+115=1f

u=-20, v= 15.
3+460=1ff=60 cm
 

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