The lower half of a vessel of depth $2d \text{ cm}$ is filled with a liquid of refractive index $\mu_1$ and the upper half with a liquid of refractive index $\mu_2$. The apparent depth of the vessel seen perpendicularly is

  • A
    $d\left(\frac{\mu_1 \mu_2}{\mu_1+\mu_2}\right)$
  • B
    $d\left(\frac{1}{\mu_1}+\frac{1}{\mu_2}\right)$
  • C
    $2d\left(\frac{1}{\mu_1}+\frac{1}{\mu_2}\right)$
  • D
    $2d\left(\frac{1}{\mu_1 \mu_2}\right)$

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