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A student measures the focal length of a...

A student measures the focal length of a 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

A

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B

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C

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D

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Text Solution

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The correct Answer is:
C
In a convex lens, `u` is negative and `v` is positive (except when image is virtual). As `u` is increased `v` decreases. Therefore, graph ( c) is the correct choice in Fig.
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