Which of the following examples are based upon the total internal reflection of light?

(A) Optical fibre
(B) Twinkling of stars
(C) Mirage
(D) Sparkling of diamond

Choose the correct answer from the options given below:

(A), (C) and (D) only

The correct answer is Option (2) → (A), (C) and (D) only

Explanation:

(A) Optical fibre works on the principle of total internal reflection, which allows light signals to travel long distances with negligible loss.

(C) Mirage is an optical illusion in deserts or on hot roads where light rays bend and undergo total internal reflection due to varying air densities.

(D) Sparkling of diamond occurs because light entering a diamond undergoes multiple total internal reflections inside, giving it brilliance.

(B) Twinkling of stars is due to atmospheric refraction, not total internal reflection.