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_(r ))//2)/(sin A//2)`
Then, calculate, `(delta_(v) - delta_( r)) = 4^(@)6'`