Snell's law
From JSXGraph Wiki
Refraction of a light ray emanating from the source L at the interface between two environments of different refractive indices, n1, n2.
Reference: https://en.wikipedia.org/wiki/Snell%27s_law
Refraction of a light ray emanating from the source L at the interface between two environments of different refractive indices, n1, n2.
Reference: https://en.wikipedia.org/wiki/Snell%27s_law