One possible material for spectacle lenses is PMMA, which has a refractive index (for yellow light travelling from air to the material) of n = 1.5. If a ray of yellow light hits the surface at an angle of 8= 50, through how many degrees is the ray of light bent as it enters the material? (This is the angle in the diagram below, which is not drawn to scale). Give your answer to the nearest degree. The ray is bent through: