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If `._imu_j` represnts the refractive index when a ray of light goes from medium i to j, then the product `._2mu_1xx._1mu_3xx._3mu_4` is equal to

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If `._imu_j` represnts the refractive index when a ray of light goes from medium i to j, then the product `._2mu_1xx._1mu_3xx._3mu_4` is equal to
A. `._3mu_1`
B. `._3mu_2`
C. `._2mu_3`
D. `._2mu_4`
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Correct Answer - D
`._2mu_1xx._1mu_3xx._3mu_4=(mu_1)/(mu_2)xx(mu_3)/(mu_1)xx(mu_4)/(mu_3)=(mu_4)/(mu_2)=._2mu_4`
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