Water Has an Index of Refraction of 1

Multiple Choice

Water has an index of refraction of 1.333.What is the speed of light through it? (c = 3.00 × 10⁸ m/s)

A) 4.00 × 10⁸ m/s
B) 2.25 × 10⁸ m/s
C) 4.46 × 10⁸ m/s
D) 1.46 × 10⁸ m/s