Determine the index of refraction of water for five different refraction angles. The refraction angle is changed by moving the object, i.e., the movable plate at the back of the tank. The average of these five values is your final results for the index of refraction for water. Use a rectangular block of acrylic and a projection lamp to measure incident and refracted angles. Explain why the pane of glass at the front of the refraction tank can be ignored.
Diamonds sparkle as a result of total internal reflection.