Question

if a monochromatic beam of light with a wavelength of 590 nanometers is traveling through air then enters a region of space where the index of refraction is 1.5, what will the light beam do? increase, decrease, or stay the same?
It slows down, shorter wavelength, same frequency

(note it can not change frequency. There is no storage of waves, the same number have to pass a given point per unit time on each side.)
lambda = V * T
so
lambda = V/f
if V goes down/ lambda goes down

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