\textbf{165-} According to the figure below, light enters perpendicularly through face AB of a prism with refractive index $n = 2$, and continues along one of the faces of the prism. What is the angle of deviation of this ray with respect to its initial direction in degrees?
\textit{[Figure: A prism with vertex angle B at top, base AC at bottom, with angles $70^\circ$ at A and $70^\circ$ at C, and a ray entering perpendicular to face AB]}
\begin{itemize}
\item[(1)] $50$
\item[(2)] $90$
\item[(3)] $100$
\item[(4)] $160$
\end{itemize}
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