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In the above question, the correct value...

In the above question, the correct value of focal length `f` of lens as calculated from the graph is :

A

`f = (1)/(OA)`

B

`f = (1)/(OA + OB)`

C

`f = (1)/(OA -OB)`

D

`f = (1)/(OB)`

Text Solution

Verified by Experts

The correct Answer is:
D
In a convex lens, when object is at infinity, image is at focus, i.e.
when `u = oo, (1)/(u) = 0`,
`(1)/(v) = OB = (1)/(f) :. F = 1//OB`.
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