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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a
40 cm
b
20 cm
c
10 cm
d
15 cm
answer is B.
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Detailed Solution
Clearly the co-ordinates of A are (2f,2f) ∴f=402=20 cm
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