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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

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

C

`(a)/(c)`

D

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

Text Solution

Verified by Experts

The correct Answer is:
A
`(1)/(v) - (1)/(u) = (1)/(f) rArr m = (v)/(u) = 1 - (v)/(f)`
Slope `= (-1)/(f) = (c )/(b) , " " |f| = (b)/(c )`
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