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Q.

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

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a

Blue light moves faster than green light.

b

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

c

Yellow light moves with the mean speed of red and violet light.

d

Red light moves the fastest.

answer is B.

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Detailed Solution

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All the colours of white light move at the same speed through the air.
In dispersion, white light splits into seven colours (VIBGYOR). And it occurs when white light passes through a dispersive medium like a prism. This is because different colours of light travel at different speeds in an optically denser medium. Because air is not a dispersive medium, light of all wavelengths travels at the same velocity. In a vacuum, different colours of light travel at the same speed.

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