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

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

(A) In a vacuum or air,all colours of white light travel with the same speed,which is approximately $3 \times 10^8 \ m/s$. While light of different colours travels at different speeds in a medium like glass or water (leading to dispersion),they do not exhibit this difference in air. Therefore,all colours of white light propagate at the same speed in air.

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

Medium

Identify the correct statement regarding the propagation of light of different colours of white light in air.

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