1. A flashlight beam strikes the surface of a pane of glass (n = 1.5) at a 20 angle to the normal. Calculate the angle of refraction. Draw a diagram and indicate all the parameters. 2. A beam of light is shining upwards from beneath the glass at a 35 angle to the vertical. Calculate the angle of refraction (n for glass 2 1.5). Draw a diagram and indicate all the parameters. 3. Light travels from glass (n=1.56) to water (n=1.33). Calculate the critical angle for glass-water interface. Draw a diagram and indicate all the parameters