Multiple choice

Directions: The following item consists of two statements, one labeled as 'Assertion (A)' and the other labeled as 'Reason (R)'. You are to examine these two statements carefully and decide if the Assertion (A) and the Reason (R) are individually true and if so, whether the reason is the correct explanation of the Assertion. Select your answer using the codes given below.

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.

  1. Both A and R are true, and R is the correct explanation of A.

  2. Both A and R are true, but R is not the correct explanation of A.

  3. A is true, but R is false.

  4. A is false, but R is true.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A is true. This is a phenomenon of total internal reflection of light, dependent on the 'critical angle' of the incidence of light in a material medium at its bounding surface with air. R is false as refractive index of diamond is really high.

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