Question

How many times does a ray of light refract when it passes through a prism?

• A. 1
• B. 2
• C. 3
• D. 4

Hint:

A ray of light undergoes two refractions when it passes through a prism—once at entry and once at exit.

Answer 1

The Correct Option is B

Step 1: Refraction in Prism.
When a ray of light passes through a prism, it is refracted twice. First, as it enters the prism, and then as it exits the prism. Step 2: Explanation.
The light ray bends towards the normal at the first surface, and away from the normal at the second surface due to the difference in refractive indices of air and the prism material. Step 3: Conclusion.
Thus, a ray of light undergoes two refractions when passing through a prism.