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Question
A ray of light is normally incident on one face of an equilateral prism. Trace the course of the ray through the prism and emerging from it.
Long Answer
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Solution
When a ray of light is normally incident on one face of an equilateral prism, it enters the prism without any deviation (since the angle of incidence is 0°).
Inside the prism, the ray travels in a straight line and reaches the second face.
Due to the geometry of the equilateral prism (angle 60°), the angle of incidence at the second face becomes 60°.
If the angle of incidence at the second face is greater than the critical angle, the ray undergoes total internal reflection inside the prism.
It is then reflected internally towards the third face of the prism, where it emerges out after refraction.
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