Consider a light ray that enters a pane of glass with air on one side and water on the other side as shown in the figure below. The light ray experiences refraction at the first interface when it enters the glass from the water and again at the second interface when it exits the glass into the air. Assume the index of refraction of the glass 1.54. For a ray of light, find the angle of incidence θ1 in the water such that the ray experiences total internal reflection when it strikes the glass-air interface on the other side.
