Refractive index of water, kerosene, ice and glass are 1.33,1.44,1.31 and 1.5 respectively

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1

Refractive index of water, kerosene, ice and glass are 1.33,1.44,1.31 and 1.5 respectively. Arrange these in decreasing order of optical density

2

As the refractive index increases, optical density also increases.

So, decreasing order of optical density will be:

Glass > kerosene > water > ice