\documentclass[11pt]{article}
\usepackage{pstricks-add,multido,amsmath}
%\usepackage{xepersian}
\begin{document}
\begin{center}
\psset{yunit=0.8,plotpoints=300}
\begin{pspicture}(-1,-2.5)(12,2.5)%\psgrid
%\psgrid[subgriddiv=1,griddots=10,gridlabels=10pt]
 \uput[l](0,0){0}
      \uput[d](4.85,-.7){$ A $}
      \psdot(5,-.8)   
     \psline[linestyle=dashed](1.85,-.8)(9.15,-.8)
             \psdot(9.15,-.8)   
     \uput[d](9.2,-.8){$ A_{2} $}
         
             \psdot(1.85,-.8)   
     \uput[d](1.8,-.8){$ A_{1} $}
     
      \psline[linestyle=dashed](0.25,.8)(9.7,.8)
          \psdot(0.29,.8)   
     \uput[u](0.2,.8){$ B_{1} $}
           \psdot(3.4,.8)   
     \uput[u](3.3,.8){$ B_{2} $}
           \psdot(6.6,.8)   
     \uput[u](6.45,.8){$ B_{3} $}
           \psdot(9.7,.8)   
     \uput[u](9.55,.8){$ B_{4} $}
     \psbrace[ref=lC,nodesepA=-15pt,nodesepB=-15pt,braceWidth=.2mm](5,2)(0.2,2){$  \dfrac{3\lambda}{2}$ }
     \psbrace[ref=lC,nodesepA=-15pt,nodesepB=-15pt,braceWidth=.2mm](9.55,2)(5,2){$  \dfrac{3\lambda}{2}$ }
      \psplot[algebraic]{0}{10.5}{1.5*sin(2*x)}
     \psbrace[ref=lC,nodesepA=5pt,nodesepB=5pt,braceWidth=.2mm](3.4,-1.3)(5,-1.3){$\dfrac{\lambda}{2}  $}
    %  \psdot(.8,1.5)
      \psline[linestyle=dashed](5,-.8)(5,2)
         \psline[linestyle=dashed](3.4,-1.3)(3.4,.8)
       \uput[0](11,0){$x$}
\psline{->}(0,-2.5)(0,2.5)
\psline{->}(0,0)(11,0)
\uput[90](0,2.5){$y$}

\end{pspicture}
\end{center} 
\end{document}