Discussion
Assertion (A) : Diamond is used for cutting glass.
Reason (R) : Diamond has a high refractive index.
Answer: B
Correct answer: Both A and R are true but R is NOT the correct explanation of A.
Diamond does cut glass and it does have a high refractive index, so both statements are true - but they are unconnected. Diamond cuts glass because it is the hardest natural substance; its refractive index is why it sparkles. R does not explain A.
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