To form an image twice the size of the object, using a convex lens of focal length 20 cm, the object distance must be

< 20 cm

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> 20 cm

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< 20 cm and between 20 cm and 40 cm

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Solution

The correct option is C < 20 cm and between 20 cm and 40 cm
For the virtual image, u < f and for real image, u lies between f and 2f, where u is the object distance and f is the focal length. Here, for virtual image, object distance should be less than 20 cm and for real image, object distance must be between 20 cm and 40 cm.

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