| Directions (Q. No. 1 to 5): |
| Read the following text and answer the following questions on the basis of the same: |
| Sparking Brilliance of Diamond: |
| The total internal reflection of the light is used in polishing diamonds to create a sparking brilliance. |
| By polishing the diamond with specific cuts, it is adjusted the most of the light rays approaching the surface are incident with an angle of incidence more than critical angle. Hence, they suffer multiple reflections and ultimately come out of diamond from the top. This gives the diamond a sparking brilliance. |
 |
A) its critical angle with reference to air is too large.
B) its critical angle with reference to air is too small.
C) the diamond is transparent.
D) rays always enter at angle greater than critical angle.
Correct Answer: B
Solution :
Option [b] is correct. Explanation: Light cannot easily escape a diamond, because its critical angle with air is too small. Most of the reflections are total and it is cut so that light can exit only in particular direction thus light is concentrated inside and making the diamond sparkle.
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