Question

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.

Answer 1

@snowflake0531 c;

Answer 2

any ideas/guesses on what the answer may be?

Answer 3

it's B
total internal reflection is when all of the light is reflected back from one medium when the light hits another, and bounces back. and it can only happen from a denser medium to a less dense medium
a higher refractive index means light travels more slowly, which means it's more dense, and thus total internal reflection can only happen if the light is traveling from medium A to medium B