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UPSC 2000: When a CD (Compact Disc used in audio and video systems) is seen in sunlight, rainbow-like colours are seen. This can be explained on the basis of the phenomenon of
(a)reflection and diffraction
(b)reflection and transmission
(c)diffraction and transmission
(d)refraction, diffraction and transmission
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Not attemptedCorrect Answer: (d) refraction, diffraction and transmission
The closely spaced tracks on a CD act like a reflection grating. Incident sunlight is partly refracted into the transparent polycarbonate, diffracted by the spiral pits, and some of it is transmitted back, producing constructive interference that appears as rainbow colours; all three phenomena—refraction, diffraction and transmission—contribute. ([licchavilyceum.com](https://licchavilyceum.com/upsc-civil-services-prelims-2000-solved-question-paper/))
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Frequently Asked Questions
What is the correct answer to this UPSC 2000 Science & Technology question?▼
The correct answer is option (d): refraction, diffraction and transmission. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Physics question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2000, GS Paper 1, as Question 102. It falls under Science & Technology > Physics.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Physics?▼
UPSC has asked 104 questions from Physics (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.