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General
Easy
Question
An object 'O' is kept in air in front of a thin plano convex lens of radius of curvature 10 cm. It's 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.
- 5 cm
- 10 cm
- 20 cm
- none of these
The correct answer is: 20 cm
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