Shows that, part of the anterior hemisphere of rays intercepted and at once parallelized by the lens, L, whose principal focus is in the center of the flame, and the remainder is intercepted and made parallel by the paraboloid, a, vintage line drawin Calendar #395703208
Shows that, part of the anterior hemisphere of rays intercepted and at once parallelized by the lens, L, whose principal focus is in the center of the flame, and the remainder is intercepted and made parallel by the paraboloid, a, vintage line drawin Calendar #395703208
