The solution of the problem 3.51 cr 3 from the problem

The solution of the problem 3.51 cr 3 from the problem

Task 3.51
Calculate the group and phase velocities of light with a wavelength of 643.8 nm in water, if it is known that
The refractive index for this wavelength is 1.3314, and for a wavelength of 656.3 nm it is equal to
1.3311.

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