Turpentine is optically denser than water. It means

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speed of light is more in turpentine than in water

speed of light is more in water than in turpentine

when a monochromatic light passes from water to turpentine frequency decreases

mass per unit volume of turpentine is more from that of water

answer is D.

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Detailed Solution

Optical density of turpentine oil (kerosene oil) is more than that of water, even though water is more mass dense than oil.Optical density is a function of number or atoms and NOT the weight of a substance. Since kerosene is a complex carbon compound, it has more number of atoms per molecule than in water. So when light enters kerosene, it hinders it better as compared to water. hence in denser medium velocity decreases.

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