Question

Where should an object be placed in front of a convex lens to get a real image of the same size of the object..?

Answer 1

Answer:

When an object is placed at the center of curvature in front of a convex lens, its image is formed at the center of curvature on the other side of the lens. The image formed is real, inverted, and of the same size as the object

(meaning of curvature is the fact of being curved or the degree to which something is curved.)

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Answer 2

Explanation:

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.