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critical angle |
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critical angle: see refraction refraction, in physics, deflection of a wave on passing obliquely from one transparent medium into a second medium in which its speed is different, as the passage of a light ray from air into glass. ..... Click the link for more information. . critical angleIn an optical fiber, the maximum angle from the axis at which light can remain confined within the core for "total internal reflection." In contrast to the "acceptance angle," which is measured outside the fiber, the critical angle is a measurement within the fiber. See numerical aperture. critical angle [′krid·ə·kəl ¦aŋ·gəl] (architecture) The angle of pitch of a flight of stairs or a ramp that, if exceeded, is considered uncomfortable and unsafe; it is 50° for stairs and 20° for ramps. (physics) An angle associated with total reflection of electromagnetic or acoustic radiation back into a medium from the boundary with another medium in which the radiation has a higher phase velocity; it is the smallest angle with the normal to the boundary at which total reflection occurs. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| 8 degrees as transcritical, and the remaining at about 9[degrees] as supercritical, as compared to the parallel spin critical angle for total reflection being 6. Static rear stability of a manual wheelchair can be measured by tilting the occupied wheelchair rearward to find the critical angle at which it will fall backward. When geckos unpeel their toes, they presumably lever setae to that critical angle, the scientists say. |
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