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Except for fresnel lenses which are great for [[solar welding]], the design involves using mir [[Fresnel lens]]

Has anyone done the calculations on the required diameter of a fresnel lens that could be effectively used to heat the regolith in the recovery of He3 ...usly posted some numbers. It makes no difference whether it is a Fresnel lens versus a reflector, the diameter is the same. At large apertures, lenses h