Discussion
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Reflecting surfaces of all types obey the laws of reflection. The refracting surfaces obey the laws of refraction.
Reason R: Refractive index of a transparent medium is the ratio of the speed of light in vaccum to that in the medium.
In the light of the above statements, choose the most appropriate answer from the options given below:
Answer: B
The answer is Both A and R are correct but R is not the correct explanation of A.
The Assertion is true: every reflecting surface, plane or curved, obeys the laws of reflection, and every refracting surface obeys the laws of refraction.
The Reason is also true: the absolute refractive index of a medium is the speed of light in vacuum divided by its speed in that medium. But a definition of refractive index does not explain why surfaces obey the laws of reflection and refraction, so R is not the explanation of A.
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