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(a) The refractive index of glass is 1.5. What is the speed of light in glass? ("Speed of light in vacuum is "3.0 xx 10^(8) m s^(-1)) (b) Is the speed of light in glass independent of the colour of light? If not, which of the two colours red and violet travels slower in a glass prism? |
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Answer» Solution :(a) `2.0xx10^(8)ms^(-1)` (b) No. The refractive index, and hence the speed of light in a medium, DEPENDS on WAVELENGTH. [When no particular wavelength or colour of light is specified, we may take the given refractive index to refer to yellow colour.] Now we know violet colour deviates more than red in a glass PRISM, i.e. nv > nr . Therefore, the violet COMPONENT of WHITE light travels slower than the red component. |
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