翻訳と辞書 Words near each other ・ Vistula Spit ・ Vistula Spit Landscape Park ・ Vistula Veneti ・ Vistula, Indiana ・ Vistulans ・ Vistula–Oder Offensive ・ Vistən ・ Visu ・ Visual (album) ・ Visual 1050 ・ Visual 50 ・ Visual acuity ・ Visual agnosia ・ Visual analogue scale ・ Visual analytics ・ Visual angle ・ Visual anthropology ・ Visual appearance ・ Visual approach ・ Visual approach slope indicator ・ Visual Art High school of Kermanshah ・ Visual Art Institute ・ Visual art of the United States ・ Visual artifact ・ Visual Artists Rights Act ・ Visual arts ・ Visual Arts Brampton ・ Visual arts by indigenous peoples of the Americas ・ Visual Arts Center of Northwest Florida ・ Visual Arts Center of Richmond Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Visual angle ： ウィキペディア英語版 Visual angle The visual angle is the angle a viewed object subtends at the eye, usually stated in degrees of arc. It also is called the object's angular size. The diagram on the right shows an observer's eye looking at a frontal extent (the vertical arrow) that has a linear size $S$, located in the distance $D$ from point $O$. For present purposes, point $O$ can represent the eye's nodal points at about the center of the lens, and also represent the center of the eye's entrance pupil that is only a few millimeters in front of the lens. The three lines from object endpoint $A$ heading toward the eye indicate the bundle of light rays that pass through the cornea, pupil and lens to form an optical image of endpoint $A$ on the retina at point $a$. The central line of the bundle represents the chief ray. Likewise for object point $B$ and its retinal image at $b$. The visual angle $V$ is the angle between the chief rays for $A$ and $B$. ==Measuring and computing== The visual angle $V$ can be measured directly using a theodolite placed at point $O$. Or, it can be calculated, in radians, using the formula, $V\; =\; 2\; \backslash arctan\backslash left(\backslash frac\backslash right)$. However, for visual angles smaller than about 10 degrees, this simpler formula provides very close approximations: : $\backslash tan\backslash left(\; V\; \backslash right)\; =\; \backslash frac.$ 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Visual angle」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.