Is 2.5m/s faster than 4m/s

Which statement is true if the refractive index of medium a is greater than that of medium b? a. total internal reflection is possible when light travels from air to medium b to medium a. b. total internal reflection is possible when light travels from medium a to medium b. c. total internal reflection is possible when light travels from medium b to medium a. d. total internal reflection is possible when light travels from air to medium a. e. total internal reflection is possible when light travels from air to medium b.

Look at the electroscope, describe how you can cause the two leaves at the bottom to repel each other and stay that way

Why is the moon’s surface cratered, but the earth’s is not