A dobleconves lens of focal length 6cm is made of glass of refractive index 1.5 the radius of curvature of of one surface is double that of other surface. The value of small radius of curvature is
A
6cm
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B
4.5cm
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C
9cm
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D
4cm
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Solution
The correct option is C4.5cm Given |R1|=2|R2|=R|R1|=R,R1=R|R2|=R2,=R2=−R2n=1.5f=6cm