The least distance between a point object and its
real image formed by a convex lens of focal length
Fis
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The distance between the object and the image is the least when the object is kept at the centre of curvature in which case, the real image too will be formed on the centre of curvature on the other side.
c = 2 f
Total distance between the object and the image will bed
c + c = 2 c
d = 2 × 2 f = 4 f Regards
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