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- W941431718 abstract "This chapter discusses the basic optical instruments. The basic structure and theory of each type of instrument is discussed, as well as performance criteria, limitations, and caveats. The chapter discusses the visual system. A magnifier is a single lens that produces for visual observation an erect virtual image of a nearby object. The purpose of an eyepiece is the same, but its object is an image formed by a preceding optical system. The eyepiece is discussed here as a separate instrument, since its function is the same wherever it is found. Afocal systems, whose power is zero, have a number of unique and useful properties that are not widely known. Afocal systems are also referred to as telescopes, since visual telescopes are afocal. Afocal and focal systems differ in kind, not merely in degree; afocal systems are not merely focal systems with an infinite focal length. Afocal systems have no focal points, no principal planes, and no nodal points, that is, none of the cardinal points of a focal system. The autocollimator, one of the most important instruments in metrology, is used both for measuring small differences in angles and as a nulling device for setting angles. Schlieren systems show variations in the optical path length of light passing through transparent objects or reflecting from the surface of specular objects by causing the path length differences to appear as irradiance variations." @default.
- W941431718 created "2016-06-24" @default.
- W941431718 creator A5066369587 @default.
- W941431718 date "1989-01-01" @default.
- W941431718 modified "2023-09-25" @default.
- W941431718 title "4 Basic Optical Instruments" @default.
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