\begin{figure} \centering
\includegraphics[width=8.5cm]{1.jpg}
\caption{\label{fig:1} fig 1}
\end{figure}
PREFERRED WAY:
\begin{figure} \centering
\subfigure[description for figure 1]{\label{fig-1}\includegraphics[width=8cm]{fig1.jpg}}
\subfigure[description for figure 2]{\label{fig-2}\includegraphics[width=8cm]{fig2.jpg}}
\subfigure[description for figure 3]{\label{fig-3}\includegraphics[width=8cm]{fig3.jpg}}
\label{fig}
\caption{Description for all the figures}
\end{figure}
Make the general label name be the first part of the individual figures name. Each figure will be referenced in the text with (a), (b), or (c) depending on the image it is.
OLD WAY:
\begin{figure}
\includegraphics[width=8.5cm]{1.jpg}
\includegraphics[width=8.5cm]{2.jpg}
\caption{\label{fig:1} fig 1}
\caption{\label{fig:2} fig 2}
\end{figure}