Refraction of light at plane surfaces.
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3
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Explanation:
A plane passing through a refracted ray of light and drawn perpendicular to the surface at which refraction takes place. See also: plane.
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7
Answer:
When a ray of light enters a denser medium it is refracted towards the normal in such a manner than the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant, this constant being called the refractive index .
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