When a light ray enters from medium $i$ to medium $j$,if $_i\mu_j$ represents the refractive index,what is the product of $_2\mu_1 \times _3\mu_2 \times _4\mu_3$?

  • A
    $_4\mu_1$
  • B
    $_1\mu_4$
  • C
    $\frac{1}{_1\mu_4}$
  • D
    $_4\mu_2$

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