English: Sketch of a Collimator as used for Visible Light. Light (dark red arrows) emitted by the bulb on the left travels throw an aperture (A) and is formed parallel to the optical axis by plano-convex lens (L).
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Fixed lens— collimator lenses are almost always plano-convex lenses. Made bulb more like a real bulb with curled filament, changed the aperture to "A" instead of "B", why was it "B" before, anyway?