Focus and focal length - class-XII

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Question 1 of 36

The radii of curvature of the surfaces of a double convex lens are 20 cm and 40 cm respectively, and its focal length is 20 cm. What is the refractive index of the material of the lens.?

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$\dfrac{5}{2}$

$\dfrac{4}{3}$

$\dfrac{5}{3}$

$\dfrac{4}{5}$

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