Question

) The minimum distance between on
objective and its real image formed by
a convex lens of focal length 'f' is
(i) f
(ii) 2f
(iii) 3f
(iv) 4f​

Answer 1

Answer:

The minimum distance between object and image is 4f

Answer 2

Answer:

(iv) 4f

Explanation:

when the object is at radius of curvature the real image is at a minimum distance to the object

so the distance is (2f +2f) = 4f

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