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Question

A biconvex lens of local length 30 cm has radii of curvature of surfaces in ratio 3 : 2. It is cut into two ti form two plano-convex lenses. Then the focal length of two lenses are

A
120 cm, 90 cm
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B
60 cm, 40 cm
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C
75 cm, 50 cm
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D
50 cm, 25 cm
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Solution

The correct option is C 75 cm, 50 cm
130=(μ1)×(13R+12R) (μ1)R=(125).......(1) 1f1=(μ1)×13R=13×125 f1=75 cmAnd 1f1=(μ1)×12R=12×125 f2=50 cm

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