You are given kerosene oil, turpentine oil and water having optical densities 1.44, 1.47, 1.33 respectively. In which of the medium, the speed of light is maximum and why?

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Solution

The speed of light in a medium is inversely proportional to the optical density of the medium.

Among the given liquids, water has least density. So, the speed of light is maximum in water.

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1.44, 14.7

1.33

Find out, from Table, the medium having highest optical density. Also find the medium with lowest optical density.

Material mediumRefractive indexMaterial mediumRefractive indexAir1.0003Canada Balsam1.53Ice1.31−−Water1.33Rock salt1.54Alcohol1.36−−Kerosene1.44Carbon disulphide1.63Fused quartz1.46Dense flint glass1.65Turpentine oil1.47Ruby1.71Benzene1.50Sapphire1.77Crown glass1.52Diamond2.42

You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in Table.

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