An object ' O ' is kept in air in front of a thin plano convex lens of radius of curvature 10 cm . Its refractive index is $3/2$ and the medium towards right of plane surface is water of refractive index $4/3$ . What should be the distance ' x ' of the object so that the rays become parallel finally?

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​ v μ 3 ​ ​ − u μ 1 ​ ​ = R 1 ​ μ 2 ​ − μ 1 ​ ​ + R 2 ​ μ 3 ​ − μ 2 ​ ​ ∞ μ 3 ​ ​ − x 1 ​ = 10 1.5 − 1 ​ + ∞ 4/3 − 3/2 ​ x − 1 ​ = 10 0.5 ​ x = − 20 cm ​

Physics - Geometrical Optics Question with Solution | TestHub

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