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diff --git a/3411/CH2/EX2.8/Ex2_8.sce b/3411/CH2/EX2.8/Ex2_8.sce
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+//Example 2_8
+clc();
+clear;
+//To calculate the wavelength
+k=2
+theta1=10            //units in degrees
+dtheta=3             //units in degrees
+dlamda=5*10^-9       //units in cm
+lamda=(sin((theta1*%pi)/180)*dlamda*60*60)/(cos((theta1*%pi)/180)*dtheta*(%pi/180))   //units in cm
+printf("Wavelength of the lines is %.7f cms",lamda)
+lamda_dlamda=lamda+dlamda         //units in cm
+N=6063
+Ne=(N*k*lamda)/sin((theta1*%pi)/180)        //units in cm
+printf("\nMinimum grating width required is %.1fcm",Ne)