The ratio to radii of curvature of a biconvex lens R1:R2 = 2 : 3. Its refractive index and focal length is 1.5 and 12cm respectively. What is the value of R1? Consider R1 and R2 are positive and negative respectively.
A
5cm
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B
10cm
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C
15cm
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D
20cm
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Solution
The correct option is B10cm We know by lens maker's formula, 1f=(μ−1)[1R1−1R2]
where f if the focal length, μ is the refractive index and R1,R2 are the radii of curvature.