When certain light rays pass from a vacuum into a block of an unknown material,the measured index of refraction of the material is 3.00.What is the speed of light inside the block?
A)9.9 × 10⁶ m/s
B)4.8 × 10⁷ m/s
C)1.0 × 10⁸ m/s
D)1.9 × 10⁸ m/s
E)2.9 × 10⁸ m/s

Question

Quizplus · Accepted Answer

The speed of light in a material is given by the formula: speed of light in vacuum (c) divided by the index of refraction (n). Here, c = 3.0 × 10⁸ m/s and n = 3.00, so the speed of light in the material is (3.0 × 10⁸ m/s) / 3.00 = 1.0 × 10⁸ m/s.

When Certain Light Rays Pass from a Vacuum into a Block