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An equilateral prism and air have a critical angle of 45°. If the incoming ray is perpendicular to the refracting surface ______?

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An equilateral prism and air have a critical angle of 45°. If the incoming ray is perpendicular to the refracting surface ______? Answer: It is reflected from the second surface and emerges perpendicular from the third surface

If the incoming ray is perpendicular to the refracting surface of an equilateral prism with a critical angle of 45°, it will be reflected from the second surface and emerge perpendicularly from the third surface.

Question context

This question is part of 🚧 Civil Engineering within the broader 🛠️ Engineering Essentials subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.