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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.
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In 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.

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fiber optics glossary
numerical aperture
reflection

refraction
refractive index
total internal reflection

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.

Observation on the visibility decrease in a VCN spin resonator ... by Butterworth, J. / Journal of Research of the National Institute of Standards and Technology

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.

Managing Maneuverability and Rear Stability of Adjustable Manual ... by Tomlinson, James D / Physical Therapy

When geckos unpeel their toes, they presumably lever setae to that critical angle, the scientists say.

Gecko toes tap intermolecular bonds by P.W. / Science News

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