What is the index of refraction of a material in which the red-light wavelength is 450 nm?

What’s the regularity of blue light with a wavelength of 450
Regularity of red light = c/(lambda) =
3*10^(8)/650*10^(-9) = 4.617*10^(14) Hz
3*10^(8)/450*10^(-9) = 6.67*10^(14) Hz
The index of refraction can consequently be written when it comes to
nm? what’s the regularity of red light with a wavelength of 650
(b) nu = 3*10^8 m/s / (650nm) = 4.615*10^14 Hz

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