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The graph shows how the magnification m ...

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

A

`b//c`

B

`b//ca`

C

`bc//a`

D

`c//b`

Text Solution

Verified by Experts

The correct Answer is:
A
`(1)/(v) + (1)/(u) = (1)/(f) :. U = (fv)/(f - v)`
`:. (v)/(u) = (f - v)/(f) = 1 - (v)/(f)`
`|m|=|1 - (v)/(f)| :.` slope `(1)/(f) = b//c`
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