The angle of a prism is $A$. One of its refracting surfaces is silvered. Light rays falling at an angle of incidence $2A$ on the first surface return back through the same path after suffering reflection at the silvered surface. The refractive index $\mu$ of the prism is:
- A$2 \sin A$
- B$2 \cos A$
- C$\frac{1}{2} \cos A$
- D$\tan A$
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