Question

3. Assertion (A): Speed of light is less in kerosene than in water.
Reason (R): Kerosene is optically denser than water.
Choose the correct option:
A) Both A and R are true and R is correct explanation to A
B) Both A and R are true and R is not correct explanation to A
C) Both A and R are false
D A is true but R is false​

Answer 1

(A) The assertion and reason are true and the reason is the correct explanation of assertion

Explanation:

1.The optical density, also an intensive property, determines the refractive index of a material.The material will have a lower refractive index if the speed of light in it is faster than any other material.

2.A material with a lower refractive index will have a lower optical density but will have a higher speed of light when passing through it.Kerosene is optically denser than water but it still has a lower mass density than water. This justifies that the two properties are not always related.