The vitreous humor, a transparent, gelatinous fluid that fills most of the eyeball, has an index of refraction of 1.34. Visible light ranges in wavelength from 400 nm (violet) to 700 nm (red), as measured in air. This light travels through the vitreous humor and strikes the rods and cones at the surface of the retina.
What are the ranges of the frequency of the light just as it approaches the retina within the vitreous humor? express your answers in hertz separated by a comma.