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[" If the refractive angles of two prism...

[" If the refractive angles of two prisms made of crown "],[" glass are "10^(@)" and "20^(@)" respectively,then the ratio of "],[" their colour deviation powers will be "],[[" (a) "1:1," (b) "2:1],[" (c) "4:1," (d) "1:2]]

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