Question

Show that the least possible distance between an object and its real image is a convex lens is 4f, where f is the focal length of the lens.

Answer 1

Explanation:

Let, d be the distance between the image and the object. If the image distance from the lens is x, the object distance from the lens will be (d – x). Thus, u = – (d – x) and v = + x. Hence, 4f is the minimum distance between the object and its real image formed by a convex lens..

Answer 2

Answer:

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