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Physics
The branch of science concerned with the properties of matter and energy and the relationships between them.
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Physics > Optics 
optical fiber
Physics; Optics
An optical fiber is a very thin thread of glass inside a protective coating(clad). Optical fibers are used to carry information in the form of light.
angle of incidencs
Physics; Optics
The angle of an incident ray measured from a ray perpendicular to the surface.
Rochester Cloak
Physics; Optics
Rochester Cloak is an optical device that makes solid objects disappear, similar to the magic power of Harry Potter's 'invisibility cloak' that makes things disappear ...
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