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Question

An object 20 cm from a convex lens forms a virtual image 15 cm behind the lens. The focal length of the lens is


A

8.5 cm

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B

307 cm

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C

907 cm

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D

607 cm

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Solution

The correct option is D

607 cm


Taking new Cartesian sign conventions,

image distace, v=+15 cm

object distance, u=20 cm

Using lens formula,

1v1u=1f115120=1f
4+360=1ff=607 cm


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