NEET Physics Lenses MCQ Question
An equiconvex lens is cut into two halves along (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 an equiconvex lens is cut along the optical axis, the focal length of each half remains the same as the original lens. However, when cut perpendicular to the optical axis, the focal length doubles.
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