A beam of light containing red and blue light is incident on a 45° - 90° - 45° prism, as shown. The incident ray is parallel to the base of the prism. The index of refraction for blue light is 1.64 and the index of refraction for red light is 1.61. Calculate the dispersion angle between the blue and red light passing through the prism.

A beam of light containing red and blue light is incident on a 45° - 90° - 45° prism, as shown. The incident ray is parallel to the base of the prism. The index of refraction for blue light is 1.64 and the index of refraction for red light is 1.61. Calculate the dispersion angle between the blue and red light passing through the prism.