AIPMT PRELIMS2003Physics-Optics
AIPMT PRELIMS 2003 Physics Lenses MCQ Question
Type: MCQ-conceptual-Medium-Class 12
A equiconvex lens is cut into two halves along (i) XOX' and (ii) YOY' as shown in the figure. Let f, f' be the focal lengths of the complete lens, of each half in case (i), and of each half in case (ii), respectively.
A
f = f', f'' = 2f
B
f' = 2f, f'' = f
C
f' = f'', f' = f
D
f' = 2f, f'' = 2f
Correct Answer
Option A
Detailed Explanation
Cutting the lens along the principal axis (XOX') does not change the focal length, but cutting along the optical axis (YOY') doubles the focal length of each half.
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