Compléter game reflection Version en ligne juego de reflexión par Carlos Cristancho 1 apparently glass which light you that substance light straw notice when change because dense Another example speed phenomenon occurs transmitting light is refraction , consists of a of of passing from one medium to another ; This can be air - water - air or air - glass - air . For , if put a straw into a with water , you that the folds . This is passes from a less dense to a one .