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Which term is defined as the ratio of the speed of light in a vacuum to the speed of light in the material it is passing through?

A. index of refraction
B.index of reflection
C.angle of reflection
D.angle of incidence

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The ratio of the speed of light in a vacuum to the
speed of light in the material it is passing through
is the index of refraction of that material. (A)
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User Prabu R
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