Given below are two statements
Assertion (A): A diamond sparkles more than a glass imitation cut to the same shape.
Reason (R): The refractive index of diamond is less than that of glass.
In context of the above two statements, which one of the following is correct?
Both A and R are true and R is the correct explanation of A
Both A and R are true and R is not a correct explanation of A
A is true but R is false
A is false but R is true