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A light ray is falling on a face of an equilateral glass prism

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1. A light ray is falling on a face of an equilateral glass prism (60° apex, 90° base) as shown. Which one of the following diagrams correctly shows the complete path of the ray through the glass prism? **[NDA & NA (I) 2026, GAT, Q73]**

Diagram (a): ray enters perpendicular to the upper-left face, strikes the hypotenuse, and exits downward through the hypotenuse near the bottom-right vertex.

Diagram (b): ray enters the upper-left face, undergoes total internal reflection at the hypotenuse back toward the left face, then exits downward-left through the left face.

Diagram (c): ray enters the upper-left face perpendicular, undergoes total internal reflection at the hypotenuse, and exits perpendicular straight down through the base.

Diagram (d): same as (c) but the ray exits through the base slightly displaced from the perpendicular.

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