Final answer:
The index of refraction is calculated by dividing the speed of light in a vacuum by the speed of light in the medium. In this case, the index of refraction is 4.48.
Step-by-step explanation:
The index of refraction is a property of a medium that describes how much light slows down when it travels through that medium compared to its speed in a vacuum. It is calculated by dividing the speed of light in a vacuum by the speed of light in the medium. In this case, if the speed of light in the medium is 6.70×10⁷ m/s, we can find the index of refraction by dividing the speed of light in a vacuum (3.00×10⁸ m/s) by the speed in the medium:
Index of refraction = Speed of light in vacuum / Speed of light in medium
Index of refraction = 3.00×10⁸ m/s / 6.70×10⁷ m/s
Index of refraction = 4.48
Therefore, the index of refraction in the given medium is 4.48.