Question

White light is passed through a prism of angle `5^@`. If the refractive indices for red and blue colours are `1.641` and `1.659` respectively, calculate the angle of deviation between them, also calculate the dispersive power.

Answer 1

`delta=(mu_y-1)A=((mu_r+mu_0)/(2)-1)A`
`=((1.641+1.659)/(2)-1)xx5^@=(1.65-1)xx5^@`
`=3.25^@`
`omega=(mu_b-mu_r)/(mu_y-1)=(1.659-1.641)/(1.650-1)=0.028`