If the speed of light in a sphere is 2 x 10^8 m/s, its index of refraction is
a. 1.0
b. .67
c. 2.0
d. .50
e. 1.5
Answer: E. 1.5
Explanation:
n = 3 x 10^8 m/s / 2x10^8 m/s = 3/2 = 1.5
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