Various optical parts need various optical materials. Aluminium with various types of finish and powder-coated metal sheets are used for reflectors. Clear polycarbonate (PC), polystyrene, and Polymethylmethacrylate (PMMA) are used for micro-prismatic diffusers and lenses.
Materials for reflective optics – with various characteristics are available in order to achieve different types of reflection. There are three basic types of reflection: mirror, diffuse and mixed reflection. Difference between types of reflection is in the proportion of mirror and diffuse part of reflection.
|Ideal mirror reflection||Real mirror reflection||Ideal diffuse reflection||Mixed reflection|
|Lambertian reflection||Lambertian with mirror reflection|
Figure 2.5.1: Different types of reflection from material.