entrance pupil

entrance pupil

noun Optics.
the image of the aperture viewed from the objective of an optical system limiting the rays that enter the system.
Compare exit pupil.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Entrance pupil is always a great word to know.
So is lollapalooza. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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