2.5 Materials

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.

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