The speed of light in a vacuum is approximately 2.99 meters meters per second , and the speed of light through a piece of glass is approximately 1.97 meters meters per second What is the index of refraction for the piece of glass?

The index of refraction is the speed of light in a vacuum divided by its speed in the material: n = c/v. Using the given speeds, n = (2.99 × 10^8)/(1.97 × 10^8) = 2.99/1.97 ≈ 1.52; the powers of ten cancel. So the index of refraction is 1.52, choice C.

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