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  4. Which one of the following colour has the least speed in glass?

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Q. Which one of the following colour has the least speed in glass?

ManipalManipal 2001Ray Optics and Optical Instruments

Solution:

Speed of light waves is given by
$v=n \lambda$
Its the black and white colours are not physical colours and violet colour has the minimum wavelength. Hence, the velocity of violet colour is least.