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-rwxr-xr-x1271/CH2/EX2.31/example2_31.sce11
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diff --git a/1271/CH2/EX2.31/31.txt b/1271/CH2/EX2.31/31.txt
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+ No. of lines per cm = 3086 \ No newline at end of file
diff --git a/1271/CH2/EX2.31/example2_31.sce b/1271/CH2/EX2.31/example2_31.sce
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+clc
+// Given that
+lambda1 = 5.4e-7 // wavelength of light for nth order in meter
+lambda2 = 4.05e-7 // wavelength of light for (n+1)th order in meter
+theta = %pi / 6 // angle of diffraction in radian
+// Sample Problem 31 on page no. 2.50
+printf("\n # PROBLEM 31 # \n")
+k = (lambda1 * lambda2) / ((lambda1 - lambda2) * sin(theta)) // calculation for b+d
+N = (1 / k) * (0.01) // calculation for no. of lines per cm
+printf("\n Standard formula used \n b+d = (lambda1 * lambda2) / ((lambda1 - lambda2) * sin(theta)). \n N = (1 / k) * (0.01). \n")
+printf("\n No. of lines per cm = %d ",N)