Alight wave has a 670 nm wavelength in air. its wavelength in a transparent solid is 420 nm.? what is the speed of light in this solid? what is the light's frequency in the solid? a light wave has a 670 nm wavelength in air. its wavelength in a transparent solid is 420 nm.? what is the speed of light in this solid? what is the light's frequency in the solid? answers as well as explanations would be greatly appreciated so that i can understand how to work the problem when i solve it later. 1 following 1 answer 1 report abuse are you sure you want to delete this answer? yes no