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Q.

A double convex lens has radii of curvature of 2 m and 3m. What should be the refractive index of the medium so that the focal length of the lens is 100 cm ?

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a

1.2

b

2.2

c

2.4

d

1.4

answer is B.

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Detailed Solution

1f=(μ−1)(1R1+1R2) 11=(μ−1)(12+13) μ−1=65 μ=65+1=115=2.2

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A double convex lens has radii of curvature of 2 m and 3m. What should be the refractive index of the medium so that the focal length of the lens is 100 cm ?