While listening to sad rather than happy music, people are more likely to perceive a spoken word as mourning rather than morning. this best illustrates that perception is influenced by?

Which statement is correct? the speed of the light ray is the same in air and medium a. the speed of the light ray is the same in air and medium b. medium a and medium b have different densities because light refracts at different angles. medium a and medium b have the same density because the light ray strikes both at the same angle.