Light Travels Through Air at 300 Million Ms−1. on Entering Water It Slows Down to 225 Million Ms−1. Calculate the Refractive Index of Water. - Science

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Light travels through air at 300 million ms−1. On entering water it slows down to 225 million ms−1. Calculate the refractive index of water.

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Here, mediums 1 and 2 are air and water, respectively.
Refractive index of water = Speed of light in air / Speed of light in water
= 300 million ms−1  / 225 million ms−1 
=  1.33
Therefore, refractive index of water is 1.33.

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Lakhmir Singh Class 10 Physics (Science)
Chapter 5 Refraction of Light
Q 18.3 | Page 228
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