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Optical Density

Which medium ...

Question

Which medium has the highest optical density?

A

Vacuum

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B

Air

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C

Water

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D

Glass

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Solution

The correct option is (B) Water
The medium in which the speed of light is less is optically denser.
Water has the highest optical density because the speed of light is less in water compared to the speed of light in vacuum, air, and glass.

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

Material medium	Refractive index	Material medium	Refractive index
Air	1.0003	Canada Balsam	1.53
Ice	1.31	-	-
Water	1.33	Rock salt	1.54
Alcohol	1.36	-	-
Kerosene	1.44	Carbon disulphide	1.63
Fused quartz	1.46	Dense flint glass	1.65
Turpentine oil	1.47	Ruby	1.71
Benzene	1.50	Sapphire	1.77
Crown glass	1.52	Diamond	2.42

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