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UPSC 2001: When light waves pass from air to glass, the variables affected are
(a)Wavelength, frequency and velocity
(b)Velocity and frequency
(c)Wavelength and frequency
(d)Wavelength and velocity
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Not attemptedCorrect Answer: (d) Wavelength and velocity
When light enters a denser medium its speed decreases; because frequency remains unchanged, the wavelength shortens in proportion to the speed. Therefore the variables affected are wavelength and velocity only. ([britannica.com](https://www.britannica.com/video/refraction-speed-of-light-changes-glass/-203620?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2001 Science & Technology question?▼
The correct answer is option (d): Wavelength and velocity. 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 2001, GS Paper 1, as Question 104. It falls under Science & Technology > Physics.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
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.