In the following question the 1st and the last part of the sentence/passage are numbered 1 and 6. The rest of the sentence/ passage is split into four parts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence/passage and find out which of the four combinations is correct. 1. Security inks misuse a similar rule that causes the clear and always showing signs of changing shades of a film of oil on water. P. At the point when two beams of light meet each other in the wake of being reflected from these distinctive surfaces, they have each travelled somewhat extraordinary distances. Q. The key is that the light is bouncing off two surfaces, that of the oil and that of the water layer beneath it. R. The separation the two beams travel figures out which wavelengths, and thus, meddle productively and look brilliant. S. Since light is an electromagnetic wave, the pinnacles and troughs of each beam at that point meddle either usefully, to seem brilliant, or dangerously, to seem diminish. 6. Since the separation the beams travel changes with the point as you take a look at the surface, diverse hues look splendid from changed review edges. Correct Answer QPSR The correct answer is option 2. The correct structure of the passage is QPSR. Statement 1 states a general idea which is followed by statement Q which highlights the reason for the signs of changing shades of a film of oil on water. Statement P gives an explanation for the phenomenon mentioned in the previous statement, i.e. Q. Hence, it follows statement Q. Statement S follows the previous statements and statement R highlights the idea of productive meddle of the two beams and thus, logically follows S. Hence, the correct sequence is QPSR.