1(vi)
For a convex lens, the minimum distance between an object and its real image in terms of focal length (f) of a given lens must be:
- (a)1.5 f
- (b)2.5 f
- (c)2 f
- (d)4 f
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4f
Reason — When the object is kept at 2F1, then, its image is formed at 2F2. This is the position of minimum distance between object and image (i.e., 2f + 2f = 4f).