1.

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                                                        [DPMT 1995]

A.            \[\frac{b}{c}\]
B.            \[\frac{b}{ca}\]
C.            \[\frac{bc}{a}\]
D.            \[\frac{c}{b}\]
Answer» E.


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