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A 785-nm-wavelength laser is refracted into a transparent material, where the laser light is found to...

A 785-nm-wavelength laser is refracted into a transparent material, where the laser light is found to have a wavelength of 490 nm in this material.

a) What is the speed of the laser light in this material?
b) What is the frequency of the laser light in the material?
c) How does this frequency compare to the frequency of the laser light in vacuum?

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