Appendix G THE GEOMETRY OF THE BASIC COMPOUND PARABOLIC CONCENTRATOR
It is probably simples to obtain the basic properties of the CPC from the equation of the parabola in polar coordinates. Figure G.1 shows the coordinate system. The focal length f is the distance AF from the vertex to the focus. The equation of the parabola is, then,
Figure G.1 The parabola in polar coordinates with origin at the focus, r = 2f/(1 − cosø) = f/sin2(½)ø.
This result is given in elementary texts on coordinate geometry, and it may be verified by transforming ...