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In an experiment to measure the focal le...

In an experiment to measure the focal length of a convex lens , the data for image distances (v) for difference object distance (u) are plotted to obtain the three graphs of (1) v against u , (2) `(1)/(v)` against `(1)/(u)` and (3) `u + v` against u . It possible to find the focal length directly , without any further calculations , from which of these graphs ?

A

All

B

1 and 2

C

2 and 3

D

1 and 3

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