Q20 PARAJUMBLES
Question
1. Security inks exploit the same principle that causes the vivid and constantly changing colours of film of oil on water.A. When two rays of light meet each other after being reflected from these different surfaces, they have each travelled slightly different distances.
B. The key is that the light is bouncing off two surfaces, that of the oil and that of the water layer below it.
C. The distance between the two rays determines which wavelengths, and hence colours, interfere constructively and look bright.
D. Because light is an electromagnetic wave, the peaks and troughs of each ray then interfere either constructively, to appear bright, or destructively, to appear dim.
6. Since the distance the rays travel changes with the angle as you look at the surface, different colours look bright from different viewing angles
Solution
The correct option
is B BADC
Option: (b)
(B) clearly follows (1) with 'oil and water'. (A) continues to explain the concept. (C) has to be followed by (6). (D) has to settle in between, after (A).
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