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Problem: The wavelength of red helium-neon laser light in air is 632.8 nm.What is its speed in glass that has an index of refraction of 1.48?

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Refractive index is given by:

η=cv

The speed of light in air very close to the speed of light in vacuum.

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Problem Details

The wavelength of red helium-neon laser light in air is 632.8 nm.

What is its speed in glass that has an index of refraction of 1.48?

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