A thin concave and a thin convex lens are in contact. The ratio of the magnitude of power of two lenses is 2/3 and focal length of combination is 30cm, then the focal length of individual lenses are
A
15 cm, 10 cm
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B
75 cm, 50 cm
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C
50 cm, - 50 cm
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D
50 cm, 75 cm
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Solution
The correct option is C 15 cm, 10 cm Let the power of thin concave lens be -2P and power of thin convex lens be 3P.