In this post, I included the lecture notes for a development of Snell’s Law (1621) using a Huygen’s Wavelet construction (c. 1670). Special case: Total Internal Reflection leads to a 10 minute mini lecture on optical fibres, T1 cables, repeaters and IR wavelength demultiplexing.

Snells Law – Huygens Wavelets – lecture notes

Lesson continues with applying the concept of total internal reflection to fibre optics. see post watch film 5 min.