WAEC Physics 2020 Objective — Question 13
Question 13 of 50 from the West African Examinations Council (WAEC) Physics 2020 Objective paper, with the correct answer and a full explanation.
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A beam of parallel rays from a distant object O, incident on one side of a total reflecting prism. Which diagram does not represent the correct path of the beam when it emerges from the prism?
- A. W
- B. X
- C. Y
- D. ZCorrect
Explanation
In a totally reflecting prism, the beam should undergo total internal reflection and emerge deflected by 90 deg (or as appropriate for the prism's setup) without loss of intensity; diagram Z does not represent the correct path for the beam as it emerges from the prism.
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