A double convex glass lens of focal length f and having a circular ape – McqOptions

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1.	A double convex glass lens of focal length f and having a circular aperture is cut into two halves, each having a semicircular aperture. The focal length of each half is
A.	f
B.	2f
C.	f / 2
D.	Infinite
Answer» B. 2f

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