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A helium-neon laser beam has a wavelength in air of 633 nm. It takes 1.28 ns...

A helium-neon laser beam has a wavelength in air of 633 nm. It takes 1.28 ns for the light to travel through 33.0 cm of an unknown liquid.

What is the wavelength of the laser beam in the liquid?

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Answer #1

speed of light in liquid is

refractive index is

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