Ben is super late to his Physics class and so he bolts up the stairs 15m and makes a right and runs down the hall 20 m to get to his class. Determine the magnitude of Ben's
displacement.
Hint: On your scratch paper, draw a diagram of your vectors. Use tip to tail method.
Draw a dotted line from where he started to where he finishes to make a triangle. Use
the Pythagorean theorem to solve and figure out the magnitude.

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.