Question

**Assertion: the mass density of kerosene is less than water but it is optically denser than water.
**Reason: the refractive index of kerosene is more than the refractive index of water. Refractive Index of a medium various inversely to its mass density.​

Answer 1

Both A AND B ARE RIGHT AND R IS THE CORRECT Explaination

Answer 2

ASSERTION: True

REASON: False

Explanation:

• Assertion is true that the mass density of kerosene is less than that of water.
• Water has a mass density of $1\ g.cm^{-3}$ where as mass density of kerosene is $0.81\ g.cm^{-3}$. This is the reason that kerosene floats on water. Due to which we use it on the stagnant water surface to prevent mosquito-breeding.

Such oil spills are also harmful for the marine life because it prevents the dissolution of oxygen into the water and also slows down the speed of the sunlight reducing the intensity of energy reaching the aquatic life for their survival. But the refractive index in no way is related to the mass density of the substance as mentioned in the reason. Hence the reason is false.

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TOPIC: optical density, mass density

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