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+clc;
+//page no 706
+//prob no. 18.7.1
+//refer example 18.3.1
+a=4/3;//aspect ratio
+D=48.26*10^-2;//CRT tube diagonal
+Nh=647;
+H=sqrt((a^2)*(D^2)/(1+a^2));
+//Determination of viewing angle & minimum dist. 
+w=H/Nh;
+theta=Nh*(1/60);//As each pixel subtend 1 minute of arc
+disp('degree',theta,'The viewing angle is');
+X=H/(2*tand(theta/2));
+disp('m',X,'The min. viewing dist is');
+\ No newline at end of file