When a pencil of white light is incident on a prism, one gets different colours due to dispersion. This dispersion is because
A
The refractive index of a material is a constant.
B
The velocity of light in a medium depends on the wavelength of light.
C
The velocity of light in a medium depends on the frequency of light
D
The refractive index depends on the angle of the prism.
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The correct Answer is:
B
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