The speed of light in a certain solid is measured as 2.012 x 10^8 m/s. Using n equals c over v with c equals 3.00 x 10^8 m/s, what index of refraction results, and which table material does it match?

1. Index of refraction is n = c/v. 2. Substituting values: n = (3.00 x 10^8 m/s) / (2.012 x 10^8 m/s). 3. Carrying out the division gives n = 1.49. 4. This value matches polystyrene exactly, according to the table of indices of refraction. 5. n = 0.67 comes from inverting the ratio, which cannot be correct since n must be at least one. 6. n = 2.01 and n = 1.00 do not match the calculated ratio of these two speeds at all. _Source: OpenStax Physics (CC BY 4.0), Ch 16 "Mirrors and Lenses", section 16.2 Refraction_