A first example setup

For illustrating how to step-by-step set-up and run a ray-tracing simulation, a Cassegrain reflector simulation as shown in Figure 1 is discussed in this page. The Cassegrain reflector is a combination of a primary concave mirror and a secondary convex mirror, often used in optical telescopes and radio antennas, the main characteristic being that the optical path folds back onto itself, relative to the optical system's primary mirror entrance aperture. The reflector is composed of three components, a primary mirror, a secondary mirror and a receiver.