3) “Things used to make other things” is basically the definition of: A) resources B) economics C)
productions process D) macroeconomics

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.