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Solution


Q.

Assertion : The refractive index of kerosene is 1.44 which is optically denser than water.
Reason : The mass density of kerosene is lesser than water.
1 Both assertion and reason are correct and reason is the correct explanation of assertion.  
2 Both assertion and reason are correct but reason is not the correct explanation of assertion.  
3 Assertion is true but reason is false.  
4 Assertion is false but reason is true.  

Ans.

(2)

We know that the refractive index of kerosene is 1.44 and the refractive index of water is 1.33. It shows that kerosene is optically denser than water. But the mass density of kerosene is lesser than water. So, there is no relation between mass density and optical density. Therefore, it clearly defines that an optically denser medium may not possess greater mass density. Thus, the given assertion and reason are correct but reason is not the correct explanation of assertion.