Exam-style question
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What is the condition for total internal reflection to occur?.
- A.The angle of incidence is greater than the critical angle.
- B.The angle of incidence is equal to the critical angle.
- C.The angle of incidence is less than the critical angle.
- D.The light must be incident on a denser medium.
Model answer
What a good answer should say
- The angle of incidence is greater than the critical angle.
Explanation
Why this works
Total internal reflection occurs when the angle of incidence exceeds the critical angle, which is the minimum angle for which light cannot pass through the boundary and is completely reflected back into the denser medium.
Common mistake
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