A parallel beam of light falls on convex lens then what is follows ?
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A parallel beam of white light falls on convex lens. the other side of the lens at a distance of 20 cm, 20.5 cm and 21.4 cm respectively. The dispersive power of the material of the lens will be :- ... Hence when the parallel beam of white light falls on a convex lens in the question, violet colour focused at 20 cm
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