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A beam of white light falling on a glass...

A beam of white light falling on a glass prism gets split into seven colours marked 1 to 7.

Which of the following statements is correct regarding the propagation of light of different colours of white light in air?
(i) Red light moves fastest
(ii) Blue light moves faster than green light
(iii) All the colours of the white light move with the same speed
(iv) Yellow light moves with the mean speed as that of the red and the violet light.

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