What is the speed of light in a material that has an index of refraction of 2.0? A) 6.0 × 10⁸ m/s B) 1.5 × 10⁸ m/s C) 2.0 × 10⁸ m/s D) 5.0 × 10⁸ m/s E) No such index can exist.

Question

Quizplus · Accepted Answer

The speed of light in a material is equal to the speed of light in a vacuum divided by the material's index of refraction. Therefore, the speed of light in this material would be (3.0 x 10^8 m/s) / 2.0 = 1.5 x 10^8 m/s, which is answer choice B.

What Is the Speed of Light in a Material That