A credit card is set on top of a plastic tray and the tray is slowly accelerated across a table toward a waitress, taking the credit card with it. The patron of the restaurant pushing the tray does not touch the credit card. What type of force causes the credit card to accelerate?

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.