A particular material has an index of refraction of 2.75. What percent of the speed of light in vacuum is the speed of light in the material?
A) 36%
B) 10%
C) 8%
D) 89%

Question

Quizplus · Accepted Answer

The speed of light in a material is given by the speed of light in vacuum divided by the index of refraction. Therefore, the speed of light in the material is (1/2.75) times the speed of light in vacuum, which is approximately 36%.

A Particular Material Has an Index of Refraction of 2