Question

Which of the following statements is correct regarding the propagation of light of different colors of white light in the air?

• A. Red light moves fastest
• B. Blue light moves faster than green light
• C. All the colours of the white light move with the same speed
• D. Yellow light moves with the mean speed as that of the red and the violet light

Answer 1

The correct option is C

All the colours of the white light move with the same speed

Dispersion:

1. Dispersion occurs as a result of the varying degrees of refraction experienced by various colors of light.
2. Different colors of light may travel at the same speed in a vacuum, but they may travel at different speeds in a refracting medium.
3. The speed of violet light is slower than that of red light.

Hence, option(C) is correct.