The order of the speed of light in the different media is Air>Water>Oil>Glass. Arrange them in the increasing order of optical density.
A
Air
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B
Water
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C
Oil
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D
Glass
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Solution
The decreasing order of the speed of light:
Air >Water > Oil > Glass
As the optical density increases, the speed of light decreases.
Thus, the increasing order of optical density:
Air <Water < Oil < Glass