You are given prisms made of crown glass and flint glass with a wide variety of angles. suggest a combination of prism which will deviate a pencil of white light with out much dispersion .

Question

$\begin{array}{1 1} \text{Flint glass prism angle with crown glass of larger angle } \\ \text{Flint glass prism angle with large angle with flint glass of smaller angle } \\ \text{Flint glass prism angle with same angle as that of angle of smaller angle } \\ \text{None of the above } \end{array}$