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A Light Beam Has Speed $c$ In Vacuum and Speed $v$ In a Certain Plastic

Question 80

Question 80

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) $n = ( c / v ) ^ { 2 }$ .
B) $n = c / v$ .
C) $n = ( v / c ) ^ { 2 }$ .
D) $n = v / c$ .
E) $n = c v$ .

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