Question

find the angular displacement produced by ray of white light when it passes through the prism given that refractive index for violet colours and red colours are 1.52 and 1.50 respectively

Answer 1

Angular dispersion = angle of deviation of violet - angle of deviation of red
angle of deviation = A*(nx-1)
where A = angle of prism, nx = refractive index of colour x

Therefore, Angular displacement = A*(nv-1) - A*(nr-1)
= A*(nv-nr)
=A*(0.02)