Light travels slower in oil than in water because:

Oil has less mass density than water

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Oil has more mass density than water

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Oil has less optical density than water

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Oil has more optical density than water

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Solution

The correct option is D Oil has more optical density than water
A medium is defined to be optically denser when the speed of light through it is lower. Hence, optical density of oil is more than that of water.

Mass density of the medium is not related to the speed of light through it.

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Similar questions

Name a liquid whose mass density is less than that of water but is optically denser than water.

Ice floats on water because :

A. Ice is lighter (by mass) than water

B. Ice has a lower density than water

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