When an object is at distances x and y from a lens, a real image and a – McqOptions

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1.	When an object is at distances x and y from a lens, a real image and a virtual image is formed respectively having same magnification. The focal length of the lens is:
A.	\[\frac{x+y}{2}\]
B.	\[x-y\]
C.	\[\sqrt{xy}\]
D.	\[x+y\]
Answer» B. \[x-y\]

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