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Question

The ratio of the speed of light in a vacuum to the speed of light in a particular material is called what?

A
the coefficient of diffraction of the material.
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B
the index of refraction of the material
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C
the coefficient of refraction to the material
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D
the index of diffraction of the material.
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E
the modulus of diffraction of the material.
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Solution

The correct option is B the index of refraction of the material
The refractive index of a material is defined as the ratio of speed of light in vacuum to the speed of light in a particular material.
Refractive index of a material n=Vvacuumvmaterial

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