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diff --git a/3411/CH2/EX2.1/Ex2_1.sce b/3411/CH2/EX2.1/Ex2_1.sce
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+//Example 2_1
+clc();
+clear;
+//To calculate the no of lines in one cm of grating surface
+k=2
+lamda=5*10^-5     //units in cm
+theta=30          //units in degrees
+//We have nooflines=1/e=(k*lamda)/sin(theta)
+nooflines=sin(theta*%pi/180)/(k*lamda)            //units in cm
+printf("No of lines per centimeter is %.f",nooflines)
+//In text book the answer is printed wrong as 10^3
+//The correct answer is 5*10^3
diff --git a/3411/CH2/EX2.1/Ex2_1.txt b/3411/CH2/EX2.1/Ex2_1.txt
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+No of lines per centimeter is 5000 
+\ No newline at end of file