STANDARD Physics Lenses MCQ Question
An equiconvex lens is cut into two halves a long (i) XOX and (ii) YOY as shown in the figure let f, f', f'' be the focal lengths of the complete lens of each half in case (i) and of each half in case (ii) respectively. Choose the correct statement from the following:
f' = f, f'' = f
f' = 2f, f'' = 2f
f' = f, f'' = 2f
f' = 2f, f'' = f
Correct Answer
Detailed Explanation
When the lens is cut along XOX', each half is equiconvex with focal length f. When cut along YOY', each half becomes plano-convex, doubling the focal length to 2f.
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