Calculate angle of dispersion between red and violet colours produced by a flint glass prism of refracting angle `60^@. Mu_v = 1.663 and mu_r = 1.622`.

Answer

`4^@ 6'`

Explanation

Here, `A = 60^@`. Therefore, we cannot use the formula : `delta_v - delta_r = (mu_v - mu_r) A`
Here, we find `delta_v` from `mu_v = (sin(A + delta_v)//2)/(sin A//2)`
Also, find `delta_r`, from `mu_r = (sin (A + delta_v)//2)/(sin A//2)`
Then, calculate, `(delta_v - delta_r) = 4^@ 6'`.