2. The speed of light in a certain substance is 82% of its value in water. What is the index of refraction of that substance 1

The index of refraction of a substance is calculated using the formula: where is the speed of light in a vacuum and is the speed of light in the substance.Given that the speed of light in the substance is 82% of its value in water, we can use the fact that the speed of light in water is approximately 0.75 times the speed of light in a vacuum. Therefore, the speed of light in the substance is: Sub this into the formula for the index of refraction, we get: Therefore, the index of refraction of the substance is approximately 1.62.