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Is the Speed of Light in Glass Independent of the Colour of Light? If Not, Which of the Two Colours Red and Violet Travels Slower in a Glass Prism? - Physics

Is the speed of light in glass independent of the colour of light? If not, which of the two colours red and violet travels slower in a glass prism?

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Solution

The speed of light in glass is not independent of the colour of light.

The refractive index of a violet component of white light is greater than the refractive index of a red component. Hence, the speed of violet light is less than the speed of red light in glass. Hence, violet light travels slower than red light in a glass prism.

Concept: Refraction and Reflection of Plane Waves Using Huygens Principle - Refraction of a Plane Wave
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APPEARS IN

NCERT Class 12 Physics Textbook
Chapter 10 Wave Optics
Q 3.2 | Page 383
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