The indices for refraction for various media are as follows:
\begin{array}{|l|l|}
\hline \text { Medium } & \text { Index of Refraction }(\mathbf{n}) \\
\hline \text { Air/vacuum } & 1.00 \\
\hline \text { Ice } & 1.31 \\
\hline \text { Water } & 1.33 \\
\hline \text { Ethyl alcohol } & 1.36 \\
\hline \text { Vegetable oil } & 1.47 \\
\hline \text { Acrylic } & 1.49 \\
\hline \text { Glass } & 1.52 \\
\hline \text { Diamond } & 2.42 \\
\hline
\end{array}