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The diagram below shows two transparent materials–material $G$ and material $P$. The black path is the path of a light ray through the materials.
Which of the following statements is true?
Created for Albert.io. Copyright 2016. All rights reserved.
The sine of the angle that the light ray makes with the normal in substance $G$ is greater than the sine of the angle that the light ray makes with the normal in substance $P$.
Light travels more slowly in material $P$ than it does in material $G$.
Material $G$ must be air or a vacuum.
Material $P$ must be air or a vacuum.
The index of refraction of substance $P$ is less than the index of refraction of substance $G$.