SSC CHSL Tier 1 2015 Questions

Question 151 Which of these travel in glass with minimum velocity?
A) Green light
B) Yellow light
C) Red light
D) Violet light

Answer: Red light


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More Questions SSC CHSL (10+2) Exam Paper 2015 "Held on 15-11-2015" AB2015 (Morning Session)

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More about Light speed in glass

Light travels at a constant speed in vaccum that is 3 x 10^8 m/s. But in media like air, glass, different wavelengths in the electromagnetic spectrum travel at different speeds. Refractive Index n is inversely proportional to wavelength of light. But refractive index = Speed of light in Vaccum/Speed of light in medium Hence, speed of light in media is directly proportional to wavelength. Since wavelength increases from Violet to Red so Red travels the fastest and violet travels the slowest.

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