| 词汇 | example_english_focal-ratio |
| 释义 | focal ratiocollocation in Englishmeanings of focaland ratioThese words are often used together. Click on the links below to explore the meanings. Or, see other collocations with ratio. focal adjective uk /ˈfəʊ.kəl/ us /ˈfoʊ.kəl/ central ... See more at focal ratio noun[C] uk /ˈreɪ.ʃi.əʊ/ us /ˈreɪ.ʃi.oʊ/ the relationship between two groups or amounts that expresses how much bigger one is than ... See more at ratio Examples of focal ratioThese examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. In this study, the change in focalratio between juvenile and adult lungfish is calculated from frozen sections. Even though the principles of focalratio are always the same, the application to which the principle is put can differ. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The focal length is 3.57 mm with a focalratio of 4.6. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The primary mirror is a concave hyperboloid with 4.1 m diameter and about f/1 focalratio. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Two 48in cm concave metal mirrors were made for the telescope, each with a focalratio of f/10. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is the largest mirror of this shape and of such short focalratio; polishing it took 2 years, which was longer than anticipated. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Today's anti-reflection coatings make these usable, economical choices for small to medium aperture telescopes with focalratio f/6 or longer. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The "focal length" of the telescope objective is the diameter of the objective times the focalratio. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A 3 m secondary mirror produces an unobstructed field-of-view of 20 arcminutes in diameter with a focalratio of 15. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The drawback is the system will have a high focalratio, with a correspondingly dim image, and some vignetting. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A high focalratio also means the field of view will be narrow. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The focal length of 12.1 m combines with the baffled aperture of 3.7 m to a focalratio of 3.26. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This is of particular importance in fish, where the value may decrease from as high as 3.6 to 2.3, decreasing the focalratio of the lens. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. On longer focalratio telescopes a well-made 90-degree prism diagonal is the optimum choice to deliver the highest image contrast short of using the telescope without a diagonal entirely. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Newton's first version had a primary mirror diameter of 1.3 in and a focalratio of f/5. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Newton's first compact reflecting telescope had a mirror diameter of 1.3 inches and a focalratio of f/5. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A re-calculation of spatial resolving power using measured focal ratios from cryosectioning reveals a low ability to discriminate fine detail. Also, for fast focal ratios, the curve obtained is not sufficiently exact and requires additional hand correction. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The design is noted for allowing very fast focal ratios, while controlling coma and astigmatism. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. Want to learn more? Go to the definition of focal Go to the definition of ratio See other collocations with ratio |
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