Edge ray principle Nonimaging optics

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edge ray principle


the lens has 2 optical surfaces and, therefore, possible design (using sms design method) light rays coming edge s1 of source redirected towards edge r1 of receiver, indicated blue rays. symmetry, rays coming edge s2 of source redirected towards edge r2 of receiver, indicated red rays. rays coming inner point s in source redirected towards target, not concentrated onto point and, therefore, no image formed.


actually, if consider point p on top surface of lens, ray coming s1 through p redirected towards r1. ray coming s2 through p redirected towards r2. ray coming through p inner point s in source redirected towards inner point of receiver. lens guarantees light source crossing redirected towards receiver. however, no image of source formed on target. imposing condition of image formation on receiver imply using more optical surfaces, making optic more complicated, not improve light transfer between source , target (since light transferred). reason nonimaging optics simpler , more efficient imaging optics in transferring radiation source target.







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