in a vacuum, a certain light has a wavelength ?0 = 589 nm and travels at speed c = 3.00x10^8 m/s.
a. What is the frequency of the light?
b. What is its wavelength if traveling in diamond (index of refraction n=2.419) rather than a vacuum?
c. What is its speed if traveling in sodium chloride (index of refraction n=1.544) rather than a vacuum?