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  • A convex lens of focal length 20 cm can produce a magnified virtual as well as real image. Is this a correct statement? If yes, where shall the object be placed in each case for obtaining these images?

A convex lens of focal length 20 cm can produce a magnified virtual as well as real image. Is this a correct statement? If yes, where shall the object be placed in each case for obtaining these images?

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Answer:

The statement is correct.

When an object is placed between F and F2 of a convex lens, its enlarged, inverted and real image is formed beyond 2F2, i.e., on the other side of lens. So, for this we need to place the object between 20cm and 40cm of the lens.
When an object is placed between F and O of a convex lens, its enlarged, erect and virtual image is formed beyond F2, i.e., on the same side of lens. So, for this we need to place the object at a distance less than 20 cm from the lens.

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