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

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" /> (A) PQ is horizontal (B) QR is horizontal (C) RS is horizontal (D) either PQ or RS is horizontal

Tardigrade Admin · Accepted Answer

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).

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?

$PQ$ is horizontal

$QR$ is horizontal

$RS$ is horizontal

either $PQ$ or $RS$ is horizontal

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).