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light is collimated by the afocal system. Although the system does not alter the divergence of a collimated beam, it does alter the width of the beam, increasing
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imaging a star, the light entering the system is from the star at infinity (to the left) and the image it forms is at infinity (to the right), i.e., the
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Malacara-Hernández, Daniel; Malacara-Hernández, ZacarĂas (September 21, 2003).
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Optical system that produces no net convergence or divergence of the beam
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between the elements is equal to the sum of each element's
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Afocal systems are used in laser optics, for instance as
71:). A simple example of an afocal optical system is an
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83:. The magnification of such a telescope is given by
236:. SPIE Press. p. 187 – via Google Books.
221:. SPIE Press. p. 38 – via Google Books.
206:. CRC Press. p. 379 – via Google Books.
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129:{\displaystyle M={\frac {f_{2}}{f_{1}}},}
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