Three thin prisms are combind as shwon in figure. The refractiveindicesof the crown glass for red, yhelwo and violet rays are mu_(r), mu_(y) and mu_(v) respectively and those for the flint glassare mu'_(r), mu'_(y) and mu_(v) respectively . Find the ratio A'//A for which (a) systemproducesdeviationwithoutdispersion (achromatic combination ) and (b) systemproducesdispersion withoutdeciation (directvision arrangement).

Three thin prisms are combind as shwon in figure. The refractiveindice

1.	Three thin prisms are combind as shwon in figure. The refractiveindicesof the crown glass for red, yhelwo and violet rays are mu_(r), mu_(y) and mu_(v) respectively and those for the flint glassare mu'_(r), mu'_(y) and mu_(v) respectively . Find the ratio A'//A for which (a) systemproducesdeviationwithoutdispersion (achromatic combination ) and (b) systemproducesdispersion withoutdeciation (directvision arrangement).
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