Fact of the day: How to Calculate Refractive Angle
This will come in useful for Sec 2s when we cover refraction.
The formula (Snell's Law) is as such: n = sin i/sin r
However, when the light travels from the refractive medium with a higher refractive index first, then it should be written as: anw instead of n and the angle of incidence(i) and the angle of refraction (r) should be reversed.