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Q.

Consider the following u-v diagram regarding the experiment to determine the focal length of a convex lens.

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At the point A, the values of u and v are equal. The focal length of the lens is

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a

20 cm

b

15 cm

c

40 cm

d

10 cm

answer is B.

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Detailed Solution

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

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