Question

When the path of a light ray refracted through a glass prism is reversed, how will the angle of deviation change? Explain.

Hint:

Reversibility of light → Same path → Same angle of deviation.

Answer 1

Explanation:

• Refraction of light through a prism obeys the principle of reversibility of light.
• If the path of the light ray is reversed, it retraces the same path in the opposite direction.
• Therefore, the angle of deviation remains unchanged.

Conclusion: When the path of light is reversed through a prism, the angle of deviation remains the same.