Quality Assurance of Precision Optics: Refraction Metrology

This video, from the National Center for Optics and Photonics Education, demonstrates how refraction - "the change in direction of propagation of a wave due to a change in its transmission medium" - works. Throughout, an individual shines a red light through differently-shaped prisms to move the light's reflection around on a blank surface. Lateral beam transfers, plane-parallel slab beam deviation, and more are discussed in this video.

This video runs 4:58 minutes in length.