15.The following figure shows ray of red light incident on a glass triangular prism.It is refracted as it passes through the first face and is then refracted again through the second face.The angle of the incidence at the left boundary of the prism is 40.The index of refraction for air is 1.0003. aCalculate the angle of refraction for red light travelling form air into the left boundary of the prism. bCalculate the angle of incidence for red light at the right boundary of the prism. cCalculate the angle of refraction for red light as the rays exit the prism. Keep two significant figures for all final results