Fundamentholfundamenthol
NEET2026Physics
Q.

A ray of monochromatic light is passing through an equilateral prism (ABC) as shown in the figure. The refracted ray (QR) is parallel to its base (BC) and the angle of incidence (i) is 50°. Then the angle of deviation () is :

  1. A

    45°

  2. B

    55°

  3. C

    35°

  4. D

    40°

Solution

Since the refracted ray inside the prism is parallel to the base, the prism is at the condition of minimum deviation, so .

For an equilateral prism, A = 60°, and the angle of refraction inside is °.

Using °.

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