A student on her way to school walks four blocks east, three blocks north, and another four blocks east, as shown in the diagram,
Compared to the distance she walks, the magnitude of her
displacement from home to school is?
less
the same
cannot be
determined
greater
x
0972

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.