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diff --git a/2459/CH21/EX21.11/Ex21_11.sce b/2459/CH21/EX21.11/Ex21_11.sce
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+// chapter 21
+// example 21.11
+// page 479
+
+V=-2 // V
+Vin=5 // V
+
+// during positive half cycle
+Vc_p=Vin-V // since Vin-Vc-V=0
+// thus capacitor charges to Vc_p
+
+// during negative half cycle
+Vout=-Vin-Vc_p // since Vin-Vc_p-Vout=0
+
+// we plot input and output waveforms using the following code instead of using xcos
+
+clf()
+t=0:0.1:5*%pi
+plot(t,5*squarewave(t,50))
+plot2d(t,-Vc_p+(-Vout+V)*squarewave(t,50)/2,style=3)
+xtitle("input - blue                      output - green","t","volts")
diff --git a/2459/CH21/EX21.11/Figure21_11.JPG b/2459/CH21/EX21.11/Figure21_11.JPG
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