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A student measures the focal length of convex lens by putting an object pin at a distance 'u' from the lens and measuring the distance ' $v$ ' of the image pin. The graph between ' $u$ ' and ' $v$ ' plotted by the student should look like
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The correct answer is:
$$
\frac{1}{v}-\frac{1}{u}=\frac{1}{f}=\text { constant }
$$
\frac{1}{v}-\frac{1}{u}=\frac{1}{f}=\text { constant }
$$
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