Optics Question 643

Question: A convex lens of focal length f produces an image 1n times than that of the size of the object. The distance of the object from the lens is

[BHU 1997; JIPMER 2001, 02]

Options:

A) nf

B) fn

C) (n+1)f

D) (n−1)f

Show Answer

Answer:

Correct Answer: C

Solution:

m=f(f+u)⇒−1n=f(f+u)

⇒u=− (n+1)f

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