Refractive index of a prism whose second face is silvered, for incidence 2A returning along its path

1. A.
   $2\sin\frac{A}{2}$
2. B.
   $2\tan A$
3. C.
   $2\cos A$
4. D.
   $2\sin A$

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1. A.
   $\frac{1}{2\sin A}$
2. B.
   $\frac{1}{2\cos A}$
3. C.
   $2\sin A$
4. D.
   $2\cos A$

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1. A.
   $2\sin A$
2. B.
   $2\cos A$
3. C.
   $\dfrac{1}{2}\sin A$
4. D.
   $\dfrac{1}{2}\cos A$

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