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+//Example number 1.3, Page number 1.36
+
+clc;clear;close
+
+
+//Variable declaration
+w=0.02   // in m   
+n=1
+lamda=6.56*10**-7 // in m
+theta=(18+(14/60))*%pi/180 // in radian
+
+//Calculation
+N=(w*sin(theta))/(n*lamda) // no. of lines
+
+//Result
+printf("Total number of lines n the grating=%d",round(N))
+//Answer varies due to rounding of number"