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A series of lenses, apertures, prisms, mirrors, etc., so arranged as to perform a definite optical function.

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A telescope with which the observer sees objects right side up as opposed to the upside down view provided by the INVERTING TELESCOPE. The eyepiece in the optical system of an erecting telescope usually has four lenses, and the eyepiece in the optical system of an inverting telescope has two lenses.


The degree of ability of an optical system to distinguish between objects close together.

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