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An object placed at a distance of 16cm f...

An object placed at a distance of 16cm from a convex lens produces an image of magnification `m(m gt 1)`. If the object is moved towards the lens by 8cm then again an image of magnification m is obtained. The numerical value of the focal length of the lens is

A

12cm

B

14cm

C

18cm

D

20cm

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