A source emits monochromatic light of wavelength 568 nm in air. When the light passes through a liquid, its wavelength reduces to 427 nm. (a) What is the liquid's index of refraction? (b) Find the speed of light in the liquid. m/s Carbon disulfide (n-1.63) is poured into a container made of pelystyrene (n=1.49). What is the critical angle for total internal reflection of a light ray in the liquid when it is incident on the liquid-to- glass surface? from the normal