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Excercise 2
A light bundle going through the air makes an angle of 0° with the normal of a plexiglass plate
The refractive index of the plate is 5/3 and the refractive index of air is 1. What is the angle made by the light bundle with the normal when it's in the plexiglass plate?
sinus 0° is 0 => Snell's Law => 0 = 0
The light bundle never changed direction.