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A screen is placed 90 cm from an object. The image of the object on the screen is formed by a convex lens at two different locations separated by 20 cm, the focal length of the lens is

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21 cm

20m

21. 4 cm

21.4 m

answer is A.

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Detailed Solution

$f = \frac{d^{2} - x^{2}}{4 d}$

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