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  4. A ray of light is incident on an equilateral glass prism placed on a horizontal table. Which of the following is true for the condition of minimum deviation? <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-tca7cdfkswhrc09q.jpg />

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Q. A ray of light is incident on an equilateral glass prism placed on a horizontal table. Which of the following is true for the condition of minimum deviation?
Question

NTA AbhyasNTA Abhyas 2022

Solution:

The refracted ray is parallel to the base of the prism in the case of minimum deviation. Hence, the correct option is ( $QR$ is horizontal).