A Light Beam Has Speed C in Vacuum and Speed

question 92

Multiple Choice

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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