Question
Asked Dec 25, 2019
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Light in medium A undergoes a total internal reflection as it
reaches the interface with medium B. Which of the following
statements must be true (choose all that apply)? (a) nB < nA
(b) nB >nA (c) All light rays that undergo a total internal
reflection travel along the interface between the two materials.
(d) Light traveling in the opposite direction, from B into
A, cannot undergo a total internal reflection.

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Expert Answer

Step 1

Statement A: True 

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Total internal reflection is defined as the complete reflection of a light ray reaching an interface with a less dense medium when the angle of incidence exceeds the critical angle. For total internal reflection to occur, the condition is, nB > n 4. Hence the statement is true.

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Step 2

Statement b : False 

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Total internal reflection is defined as the complete reflection of a light ray reaching an interface with a less dense medium when the angle of incidence exceeds the critical angle. For total internal reflection to occur, the condition is ng > n4. Hence the statement is false.

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Step 3

Statement C: Fal...

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Total internal reflection is defined as the complete reflection of a light ray reaching an interface with a less dense medium when the angle of incidence exceeds the critical angle. Only rays at the critical angle travel along the interface. Hence, the statement is false.

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