Where should an object be placed in front of a convex
lens to get a real image of the size of the object?
1/ at the principal focus of the lens. 2/ at twice the focus length. 3/ at infinity. 4/between the optical centre and principal focus of the lens
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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.
Explanation:
not from google
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