Which of the following is/are true? If caught in a rip current, swim directly towards shore, using the most powerful kick possible. If caught in a rip current, swim perpendicular to shore, until you are completely out of the rip current, then swim in towards shore. If caught in a rip current, swim parallel to shore, until you are completely out of the rip current, then swim in towards shore. Don't fight the rip current; relax and let it carry you closer to shore.

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.