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Object O is kept in air in fron of a thi...

Object O is kept in air in fron of a thin plano convex lens of radius of curvature 10cm. It's refractive index is `3//2` and the medium toward right of plane surface is water of refractive indec `4//3` . What should be the distance x of the object so that the rays become parrallel finall?

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