A beam of green light has a wavelength of 500 nm in a vacuum and a wavelength of 331 nm in Plexiglas. What is the refractive index of Plexiglas?

Answerthe global climate during the paleogene departed from the hot and humid conditions of the late mesozoic era and began a cooling and drying trend which dispite having been periodically disrupted by warm periods such as the paleocene-eocene thermal maximum, persists today;

Ithink it is a. but i'm not 100 percent sure.

The density of the block of iron is lees than the density of mercury but the density of the block of iron is greater than the density of water

Answer4 million;