A lens of focal length "f" is cut into two equal parts without affecting its curvature.the two pieces will have equal focal length of : A) f. B) 2f. C) f/2. D) f/3

(A) f
Since the lens is cut into two equal parts without affecting its curvature, it means the radius of  curvature R is same for both parts and hence the focal length( F=R/2) will remain same.

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