Q: The refractive indices of flints glass prism for violet, Yellow and Red lines are 1.790, 1.795 and 1.805 respectively. Find the dispersive power of the flint glass prism.

Sol: μ_{v} = 1.790, μ_{y} =1.795 and μ_{R} =1.805

$\large \omega = \frac{\mu_R – \mu_v}{\mu_y -1}$

$\large \omega = \frac{1.805 – 1.790}{1.795 -1}$

$\large = \frac{0.015}{0.795} = 0.01887 $