Choose the correct alternative from the following : - Assertion (A) : Diamond is used for cutting glass. Reason (R) : Diamond has a high refractive index.
Answer: B. Both A and R are true but R is NOT the correct explanation of A.
Diamond is very hard due to its rigid three dimensional structure and so, it is used for cutting glass. Refractive index of diamond is high and gives it the greater transparency and brilliance.