Optics Question 577

Question: A convex lens of focal length f is placed somewhere in between an object and a screen. The distance between the object and the screen is x . If the numerical value of the magnification produced by the lens is m, , then the focal length of the lens is

Options:

A) mx(m+1)2

B) mx(m1)2

C) (m+1)2mx

D) (m1)2mx

Show Answer

Answer:

Correct Answer: A

Solution:

vu=mandv+u=xu=x1+m

1f=1v1uf=mx(m+1)2 .



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