A light beam has speed c in vacuum and speed v in a certain plastic.The index of refraction n of this plastic is A)n = cv. B)n = (v/c)². C)n = v/c. D)n = c/v. E)n = (c/v)².

Name: A light beam has speed c in vacuum and speed v in a certain plastic.The index of refraction n of this plastic is A)n = cv. B)n = (v/c) 2 . C)n = v/c. D)n = c/v. E)n = (c/v) 2 .
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Question

Quizplus · Accepted Answer

The index of refraction, n, is defined as the ratio of the speed of light in vacuum, c, to the speed of light in the medium, v, which is n = c/v.

A Light Beam Has Speed C in Vacuum and Speed