If the wavelength of the beam of light in air is 591 nm and the speed of light is 3x108 m/s, then what is the light frequency while traveling through a medium which has an index of refraction of 1.51 ? A. 5.08 x 10^12 hz B. 1.97 x 10^15 hz C. 5.08 x 10^14 hz D. 3.36 x 10^14 hz