Consider the following u-v diagram regarding the experiment to determine the focal length of a convex lens.At the point A, the values of u and v are equal. The focal length of the lens is

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40 cm

20 cm

10 cm

15 cm

answer is B.

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Detailed Solution

Clearly the co-ordinates of A are (2f,2f) ∴f=402=20 cm

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