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diff --git a/1871/CH12/EX12.7/Ch12Ex7.sce b/1871/CH12/EX12.7/Ch12Ex7.sce
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+// Scilab code Ex12.7: Pg:473 (2008)
+clc;clear;
+Pi = 1;    // Initial Power level of optical fibre, mW
+Po = 0.85;    // Output Power level of optical fibre, mW
+L = 0.5;    // Lenght of optical fibre, km
+alpha = (10/L)*log10(Pi/Po);    // Attenuation of optical signal, dB/km
+printf("\nThe attenuation of optical signal = %4.2f dB/km", alpha);
+
+// Result 
+// The attenuation of optical signal = 1.41 dB/km 
+\ No newline at end of file