165. According to the figure below, a monochromatic light ray enters a prism from air and after refraction exits the prism. Which of the following statements is not correct? $\left(\dfrac{\sqrt{2}}{2} = 0.7\right)$ [Figure: prism with apex angles $45°$ on each side, rays at $3°$ and $3°$ from normal, normal lines shown]
The angle of deviation is $6°$.
The critical angle of the prism is $45°$.
The refractive index of the prism is $\sqrt{2}$.
The speed of light in the prism is $0.7$ times the speed of light in air.
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\textbf{165.} According to the figure below, a monochromatic light ray enters a prism from air and after refraction exits the prism. Which of the following statements is \underline{not} correct? $\left(\dfrac{\sqrt{2}}{2} = 0.7\right)$
\textit{[Figure: prism with apex angles $45°$ on each side, rays at $3°$ and $3°$ from normal, normal lines shown]}
\begin{enumerate}
\item The angle of deviation is $6°$.
\item The critical angle of the prism is $45°$.
\item The refractive index of the prism is $\sqrt{2}$.
\item The speed of light in the prism is $0.7$ times the speed of light in air.
\end{enumerate}
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