Physics: Optics and Sound: UPSC Previous Year Questions (Science and Technology)
1 previous year UPSC Prelims question on Physics: Optics and Sound (Science and Technology). Choose an option to see the answer and explanation.
Explanations state facts as of the year each question was asked; words like “recently” refer to that year.
Showing 1–1 of 1 question
UPSC 2001Science and Technology · Physics: Optics and Sound
Q1. When light waves pass from air to glass, the variables affected are:
Explanation
When light waves pass from air to glass, the wavelength and velocity are affected. Velocity decreases because the speed of light in glass is less than in air due to the higher refractive index of glass. Wavelength also decreases because it is directly proportional to the velocity of light in the medium (=v/f, where ‘f’ is the frequency). Frequency remains unchanged because it is determined by the source of the light and does not depend on the medium.
Answer key for these questions
Q
UPSC year
Correct answer
1
2001
(d) wavelength and velocity
Frequently asked questions
How many previous year UPSC questions are there on Physics: Optics and Sound?
This page covers 1 previous year UPSC Prelims GS Paper-I questions on Physics: Optics and Sound (Science and Technology), asked from 1996 to 2009. Each has the correct answer and an explanation.
How should I use previous year UPSC questions for Prelims?
Attempt each question first, then open the answer and read the explanation for every option. Repeat by chapter, and track which statements UPSC reuses across years. Previous year questions show the exam pattern and difficulty level.
Which years are covered for Physics: Optics and Sound?
Questions on Physics: Optics and Sound (Science and Technology) are available for 8 years, from 1996 to 2009. Use the Year filter to practise a single paper.
