8. A plastic light pipe has an index of refraction n = 1.53. For total internal reflection what is the minimum angle of incidence if the pipe is in (a) air and 9b) water? Subscript 9. The light beam in the figure strikes surface 2 at the critical angle. Determine the angle of incidence O1. Surface 210. The index of refraction for violet light in silica flint glass is 1.66 and that for red light is 1.62. What is the angular dispersion On of visible light passing through an equilateral prism of apex angle if the angle of incidence is 50 red violet Subscript 11. Find the energy of a photon (a) having a frequency of 5.00 x 1017 Hz and (b) a photon having a wavelength of 300.0 nm