Medium
$A$ rectangular glass block is placed on a mark made on the surface of a table and is viewed from a vertical direction. If the refractive index of the glass is $\mu$ and its thickness is $d$,by what distance will the mark appear to be raised?
- A$\frac{(\mu + 1)d}{\mu}$
- B$\frac{(\mu - 1)d}{\mu}$
- C$\frac{(\mu + 1)}{\mu d}$
- D$\frac{(\mu - 1)\mu}{d}$
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