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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^(2) c)/( a)`

B

`(a)/(c )`

C

`(b)/(c )`

D

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

Text Solution

Verified by Experts

The correct Answer is:
C
`m = ( f - v)/( f) , m = 1 - (v)/( f)`
Slope ` = (-1)/( f)`
`(-1)/( f) = (c)/( b) , f = (b)/( c)`
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