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In nonimaging optics, the goal is not to form an image but simply to transfer all light from the input aperture to the output aperture.
en.wikipedia.org The three strategies are bi-static, synthetic aperture, and time of arrival.
en.wikipedia.org The peripheral white band may fade out toward the aperture.
en.wikipedia.org The large aperture is smooth and pearly within.
en.wikipedia.org However, it can be readily observed using a small telescope with an aperture of or more.
en.wikipedia.org