Why red light travels fast then violet in transparent medium??

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Solution

Red light has high wavelength thus it has more velocity while for violet colour it has least wavelength so it has least velocity when white light is passed through a transparent medium
thus

Red light travels the $f a s t e s t$ in a transparent medium and violet light travels the $s l o w e s t$ of all the colous

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(a) For which colour of white light, is the refractive index of a transparent medium (i) the least, (ii) the most?

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