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A convex lens of focal length 20 cm form...

A convex lens of focal length 20 cm forms a virtual image of size twice the size of the object.
(i) How is the distance of image v related to the distance of object ?
(ii) What is the power of lens?

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(i) v = 2u (Given I = 2 O. Magnification `m=I/O=v/u thereforev=2u)`
(ii) Given, f=20cm = 0.2m (positive)
Power `P=1/f=1/(+0.2)=+5.0D`
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