Thickness of a glass slab when an ink mark under it appears raised by x

1. A.
   $(\mu-1)\mu x$
2. B.
   $\frac{\mu x}{\mu-1}$
3. C.
   $\frac{(\mu-1)x}{\mu}$
4. D.
   $\mu(\mu-1)x$

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1. A.
   $\frac{\mu x}{\mu - 1}$
2. B.
   $\frac{(\mu-1)x}{\mu}$
3. C.
   $\frac{\mu-1}{\mu x}$
4. D.
   $\frac{\mu}{(\mu-1)x}$

Tap an option to check your answer.