Question

where should an object be placed in front of a concave lens to get a real image of the size of the object?
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Answer 1

Answer:

At twice the focal length of the lens in front of it. So if the lens has a focal length of 20 cm, the object must be placed 40cm in front of the lens which will then form an inverted image of the same size as the object, 40 cm behind the lens.

Answer 2

Answer:

concave lens can never form image of same size as that of object . they form only diminished images.

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Explanation: