When an object is at a distance x and from the optical center of a lens, a real and a virtual image are formed, respectively with same magnification. The focal length of lens is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
We have, 
Let m and m' be the magnification when object is at x and y respectivel
Then, 
and 
As 
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