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The graph shows how the magnification m ...

The graph shows how the magnification m produced by a thin lens varies with image distance v. What is the focal length of the lens used?

A

`(b)/(c)`

B

`(a)/(c)`

C

`(b^(2)c)/(a)`

D

`(b^(2))/(ac)`

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The correct Answer is:
A
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