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Find out, from Table 10.3, the medium ha...

Find out, from Table 10.3, the medium having highest optical density. Also find the medium with lowest optical density.

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Highest optical density = Diamond
Lowest optical density = Air
Optical density of a medium is directly related with the refractive index of that medium. A medium which has the highest refractive index will have the highest optical density and vice-versa.
It can be observed from table 10.3 that diamond and air respectively have the highest and lowest refractive index. Therefore, diamond has the highest optical density and air has the lowest optical density.
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