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In the displacement method , a convex le...

In the displacement method , a convex lens is placed in between an object and a screen . If one of them magnification is 3 and the displacement of the lens between the two positions is 24 cm , then the focal length of the lens is :-

A

`x/(m_(1)+m_(2))`

B

`x/(m_(1)-m_(2))`

C

`x/((m_(1)+m_(2))^(2))`

D

`x/((m_(1)-m_(2))^(2))`

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The correct Answer is:
B
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