13. direct instruction takes place when
a. children explore their surroundings and
learn based on their own curiosity and
interests.
b. a skill set is explicitly taught or an
activity is completed.
c. learning takes place through a process
of solving a specific problem.
d. the teacher shows children how
something works or how to complete an
activity.

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.