A coin rests on the bottom of a beaker filled with an unknown liquid. A ray of light from the coin travels to the surface of the liquid and is refracted as it enters into the air. A person sees the ray as it skims just above the surface of the liquid. How fast is the light traveling in the liquid? The distance (height) from the coin to the top of the water, along the y-axis, is 6 cm. The distance (width) from the top of the water, from top left corner, to where the angle is created, is 5 cm.