Three thin prisms are combined as shown in figure. The refractive indices of the crown glass for red, yellow and violet rays are `mu_r, mu_y and mu_v` respectively and those for the flint glass are `mu_r^', mu_y^' and mu_v^'` respectively. Find the ratio A'/A for which (a) there is no net angular dispersion, and (b) there is no net deviation in the yellow ray.

Answer

(a) `(2(mu_(V) - mu_(r)))/(mu'_(V) - mu_(r))`, (b) `(2(mu_(Y) - 1))/(mu'_(Y) - 1)`

Explanation

NA