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diff --git a/2780/CH3/EX3.14/Ex3_14.sce b/2780/CH3/EX3.14/Ex3_14.sce
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+clc
+//to calculate number of lines in the grating
+//theta1=theta2=30 degree
+//sin theta1=sin theta2=1/2
+lambda1=6*10^-5 
+                      //wavelength in cm
+lambda2=4.5*10^-5
+//let (e+d)=E 
+//formula is (e+d)*sin theta1=n*lambda1----------eq(1)
+//(e+d)*sin theta2=(n+1)*lambda2----------eq(2)
+//we get,
+n=lambda2/(lambda1-lambda2)  //order of spectrum
+E=n*lambda1/sin(%pi/6)
+number=1/E
+disp("number of lines is number="+string(number)+"unitless")