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The refractive index of a diamond is 2.4...

The refractive index of a diamond is 2.4. It means that:

A

the speed of light in vacuum is equal to `1/2.4` times the speed of light in diamond

B

the speed of light in the diamond is 2.4 times the speed of light in a vacuum.

C

the speed of light in a vacuum is 2.4 times the speed of light in the diamond.

D

the wavelength of light in diamond is 2.4 times the wavelength of light in vacuum.

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