Question

For a thin convex lens when the heights of the object is double than its image, its object distance is equal to _________ focal length of a lens is f(A) f
(B) 2f
(C) 3f
(D) 4f

Answer 1

(D) 4f is correct answer.

1/ (object distance) + 1/ (image distance) = 1/ (focal length) = 1/o + 1/i = 1/f, where i = 5f.

Solving for o, gives 1/o = 1/f - 1/i = 1/f - 1/ (5f) = 5 / (5f) – 1 / (5f) = (5–1) / (5f) = 4 / (5f), which gives o = (5/4)f.

Answer 2

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☸ Required Answer is ⬇ ⬇⬇ ⬇


☯ D). 4f


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