Student Exploration: Refraction Vocabulary: angle of incidence, angle of refraction, frequency, index of refraction, medium, refraction, Snell’s law , total internal reflection, wave front, wavelength, wave speed Prior Knowledge Questions (Do these BEFORE using the Gizmo.) Two runners ran side by side, each holding one end of a horizontal pole. 1. What would most likely happen if one of the runners began jogging in knee-deep water? The jogger who was running in the water probably slow down. How would this affect the direction of the runners? Explain. This would affect the direction of the runner because the runner would try to run forward, but the runner would end up slipping and most likely falling backwards.