1.

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

Answer»

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

Solution :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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