A parallel beam of white light fall on a combination of a concave and a convex lens, both of the...

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A parallel beam of white light fall on a combination of a concave and a convex lens, both of the same material. Their
\( \mathrm{P} \) focal lengths are \( 15 \mathrm{~cm} \) and \( 30 \mathrm{~cm} \) respectively for the mean

W wavelength in white light. On the same side of the lens system, one sees coloured patterns with violet colour nearer to the lens.
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