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प्रश्न
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.
संख्यात्मक
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उत्तर
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, the refractive index of water is 1.33.
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