(D) In a vacuum or air,all colours of white light travel with the same speed,which is approximately $3 \times 10^8 \ m/s$. Dispersion and differences

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

(D) In a vacuum or air,all colours of white light travel with the same speed,which is approximately $3 \times 10^8 \ m/s$. Dispersion and differences in speed for different colours only occur when light travels through a dispersive medium like glass or water. Therefore,in air,all colours of white light move with the same speed.

Class 10 Science The Human Eye and the Colourful World Refraction through a Prism and Dispersion

Medium

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

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