Short answerEasy3 marks
4
Copy the diagram given below and complete the path of the light ray PQ, as it emerges out of the prism by marking necessary angles. The critical angle of glass is 42°.
Copy the diagram given below and complete the path of the light ray PQ, as it emerges out of the prism by marking necessary angles. The critical angle of glass is 42°.
Topic: Total internal reflection in a prism
Question wording verified against source paper
Answer
Solution diagram
Exam answer
Complete the ray path so that the ray enters normally, undergoes total internal reflection at the next face, and emerges normally from the third face.
Explanation
The critical angle is 42°; the internal incidence exceeds this at the reflecting face.
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