Question

The refractive indices of flint glass for red and violet light are 1.613 and 1.632 respectively. Find the angular dispersion produced by a thin prism of flint glass having refracting angle 15∘

Answer 1

Deviation of light δ=(μ−1)A

Deviation of Red light δred=(μred−1)A and that of the Violet light δviolet=(μviolet−1)A

The dispersion =δviolet−δred=(μred−1)A−(μviolet−1)A

=(μviolet−μred)A

=(1.632−1.613)×15∘

=0.285∘