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Consider a focal length of 81.5 mm f / 2 triad lens (figure 2) the first is composed of three spherical surface the second is one of the first surface of spherical surface (the rest) for spherical surface the two design have exactly the same type of glass effective focal length field f / # as well as the overall length of the system.
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A hemispherical optical projection system according to claim 22 wherein said collimating lens assembly comprises at least three lenses arranged along said optical path each of said lenses including an index of refraction and a dispersion each of the three lenses having a common ratio of index of refraction to dispersion.
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A long range optical sensor and system for detecting the flame of forest fires or other fires while rejecting false alarms due to solar radiation is described. The sensor utilizes a collector optic that collects energy from a wide field of view and concentrates the energy onto a detector.
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1.1 Applications of Optical Components Lenses serve many functions in optical instruments. In general they are used to form real or virtual images of large or small objects at various distances or they redirect rays to form pupils a of the optical system.
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May 13 2019 · KEYWORDS: Semiconductors Oxides Refractive index Optical properties Metals Glasses Computer programming Refraction Transmittance Absorption Read Abstract + A 1989 SPIE proceedings paper described the first version of an optical properties computer code developed at the Applied Physics Laboratory.
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BK7 glass also is included in Table B 1. Residual quantities exist and many designs use it. 22 MOUNTING OPTICS IN OPTICAL INSTRUMENTS Figure 1.7 A page from an optical glass catalog showing optical and mechanical parameters for a typical glass N-BK7. (Courtesy of Schott North America Duryea PA.)
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If the corrector has the form of a refractive meniscus a class of telescopes is obtained known as the Bouwers–Maksutov type. The simplest uncorrected telescope with a good on-axis image is a parabolic mirror which forms images free of spherical aberration but off the optical axis the images are degraded by coma.
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A lunar gravity field model up to degree and order 100 in spherical harmonics named SGM 100i has been determined from SELENE and historical tracking data with an emphasis on using same-beam S-band differential VLBI data obtained in the SELENE mission between January 2008 and February 2009. Orbit consistency throughout the entire mission ...
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While large burning-glasses (crudely fashioned convex lenses of short focal length) might have been quite familiar in the sixteenth century Bourne's large long focal-length lens would have been a real rarity. Its optical quality—the accuracy of its surfaces and the homogeneity of the glass—must have been very poor.
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