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A convex lens forms a real of an object ...

A convex lens forms a real of an object with magnification `0.5`. If the object is displaced by 20 cm allong the principal axis, a real image equal to the size of the object is formed :

A

the focal length is 20 cm

B

the distance of the image from the lens initially is 25 cm

C

the distance of the object from the lens initially is 60 cm

D

the distance of the image finally the lens is 30 cm

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