Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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The Speed of Yellow Light in a Certain Liquid is 2.4 × 108 M S−1. Find the Refractive Index of the Liquid. - Physics


The speed of yellow light in a certain liquid is 2.4 × 108 m s−1. Find the refractive index of the liquid.

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Speed of yellow light in liquid (vL)= 2⋅4 × 108 m s−1

And  speed of yellow light in air speed = va

Let μL be the refractive index of the liquid


\[\mu_L  = \frac{\text{speed of light in vaccum}}{\text{velocity of light in the given medium}} = \frac{c}{v_L}\]

\[\mu_L  = \frac{3 \times {10}^8}{\left( 2 . 4 \right) \times {10}^8} = 1 . 25\]

Hence, the required refractive index is 1.25.

Concept: Introduction of Wave Optics
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HC Verma Class 11, 12 Concepts of Physics 1
Chapter 17 Light Waves
Q 4 | Page 380
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