Question

\( V_V, V_R, V_G \) are the velocities of violet, red, and green light respectively, in a glass prism. Which among the following is a correct relation?

• A. \( V_V < V_R < V_G \)
• B. \( V_V = V_R = V_G \)
• C. \( V_V < V_G < V_R \)
• D. \( V_V > V_R > V_G \)

Hint:

In a glass prism, the velocity of light decreases with the decrease in wavelength. The shorter the wavelength, the slower the light travels.

Answer 1

The Correct Option is A

In a glass prism, light of different wavelengths travels at different velocities. Since violet light has the shortest wavelength, it travels slowest in the prism, followed by red and then green light. Therefore, the velocity of violet light \( V_V \) is less than the velocity of red light \( V_R \), which is less than the velocity of green light \( V_G \). Hence, the correct relation is \( V_V <V_R < V_G \).