Find the ratio of mean deviation produced, if the ratio of dispersive power of the material of two prism are 2:3 and ratio of angular dispersions produced by them is 1:2.

Find the ratio of mean deviation produced, if the ratio of dispersive power of the material of two prism are 2:3 and ratio of angular dispersions produced by them is 1:2. Correct Answer 3:4

let ω be the mean deviation produced, ω = (angular dispersion) / dispersive power ω = (1:2 ) / (2:3) therefore, ω = 3:4.
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