Solar wedge ray-tracing
Ray-tracing done with Optgeo software : http://jeanmarie.biansan.free.fr/optgeo.html
A BK7 wedge is assumed. It is reminded that the coefficient of reflection is about 5% at 45° incience and 4% at normal incidence.
The prism angle is set so that the reflection on the rear surface of the prism is directed forward, and away from the eyepiece field of view.
The angle of the prism can be increased so that the reflected beam is sent back along the direction of the incoming light beam
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