Avery thin oil film (noil = 1.25) floats on water (nwater = 1.33). what is the thinnest film that produces a strong reflection for green light with a wavelength of 500 nm? as light travels from air into the water through the oil film, both of the reflected waves undergo a phase change. neither of the reflected waves undergoes a phase change. only one of the reflected waves undergoes a phase change.

In 1859, charles darwin published the first edition of on the origin of species, which explained his observations of various groups of animals that showed great similarities but minor differences. darwin concluded that if a population of one species separates into two different populations that live in separate locations, then over the course of many generations the different populations can develop into different species. this idea predicted many future biological findings and became the basis of modern biology. darwin’s explanation for why different species exist is best described as a(n) law. theory. inquiry. hypothesis.