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The graph between object distance u and ...

The graph between object distance `u` and image distance` v` for `a` lens is given below. The focal length of the lens is.
(a) `5 pm 0.1`
(b) `5 pm 0.05`
( c) `0.5 pm 0.1`
(d) `0.5 pm 0.05`.
.

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