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diff --git a/1871/CH5/EX5.5/Ch05Ex5.sce b/1871/CH5/EX5.5/Ch05Ex5.sce
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+// Scilab code Ex5.5: Pg:217 (2008)
+clc;clear;
+Lambda = 5e-05;    // Wavelength of spectral line, cm
+n = 2;    // Second order principal maxima 
+theta = 30;    // Direction of principal maxima, degree
+aplusb_inv = sind(theta)/(n*Lambda);    // Number of lines in one cm of grating where a is the width of slit and b is the width of opaque region in a grating, cm
+printf("\nThe number of lines on the grating surface = %d ", ceil(aplusb_inv));
+
+// Result 
+// The number of lines on the grating surface = 5000 
+\ No newline at end of file