During a sea-breeze, cool air moves from the water to the shore. This happens during the daytime when the temperature of the land is: a lower than the water temperature and the air over the water is heated and rises. b lower than the water temperature and the air over the land is heated and rises. c higher than the water temperature and the air over the land is heated and rises. d higher than the water temperature and the air over the land is heated and sinks.

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.