A light ray is falling on a face of an equilateral glass prism as shown in the figure : Which one of the following diagrams correctly shows the complete path of the ray through the glass prism?
- A. Diagram (a) ✓
- B. Diagram (b)
- C. Diagram (c)
- D. Diagram (d)
Correct Answer: A. Diagram (a)
Explanation
The ray enters normally and strikes the second face at an angle of 60 degrees. Since this is greater than the critical angle for glass (~42 degrees), it undergoes total internal reflection. It then strikes the base normally and emerges undeviated.
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