Refraction
Refraction is bending of light that occurs at interface between 2 media. The angle of refraction depends on the angle of incidence and the difference between the 2 media. When the incident ray is perpendicular to the surface, no refraction occurs and the ray passes straight through the second medium.

Example:
Bending …

Most of you aren’t aware of the changes that I’ve made to Pinwire over the years. I’ve tried to keep the modifications fairly transparent. This is the 4th version of the site I’ve made and I hope it will last for a few years.
A few years ago I added the …