Question

he speed of light in a vacuum is approximately 2.99 × 108 m/s, and the speed of light through a piece of glass is approximately 1.97 × 108 m/s.

What is the index of refraction for the piece of glass?

0.66
1.52
1.02 × 108
4.96 × 108

Answer 1

Index of refraction n = c / v = (2.99×10^8) / (1.97×10^8) ≈ 2.99/1.97 ≈ 1.52.