Quote:
Originally Posted by billdan
concave ellipsoid mirror.
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Thanks for the welcome guys.
An ellipsoid is midway between a sphere and a paraboloid and is easier to make than a convex mirror as in a cassegrain. The ellipsoid because of its shape has 2 focal points and when testing you put the light source on the near focal point and the KE on the other, which in my case is quite long, so its a direct measurement.