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diff --git a/2780/CH3/EX3.1/Ex3_1.sce b/2780/CH3/EX3.1/Ex3_1.sce
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+clc
+//to calculate angular width and linear width 
+lambda=6*10^-5
+e=0.01 //width of slit in cm
+//position of minima is given by
+sintheta=lambda/e               //sintheta=m*lambda/e             ,where m=1,2,3,......
+disp("sintheta="+string(sintheta)+" m")
+//since theta is very small,so sintheta is approximately equal to theta
+theta=sintheta
+theta1=2*theta
+disp("total angular width of central maximum is theta1="+string(theta1)+" m radians ")
+d=100  //distance in cm
+Y=theta*d
+Y1=2*Y
+disp("linear width of central maximum on the screen is Y1="+string(Y1)+" m cm")
+disp("values of m =1,2,3,............ gives the directions of first, second .............minima")