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+clc;
+//page no 707
+//prob no. 18.7.2
+//HDTV system is given
+//Refer example 18.7.1
+a=16/9;D=1.40;Nh=1840;//Assuming square pixel
+H=sqrt((a^2)*(D^2)/(1+a^2));
+//Determination of viewing angle
+theta=Nh*(1/60);
+disp('degree',theta,'The viewing angle is');
+//Determination of viewing dist
+X=H/(2*tand(theta/2));
+disp('m',X,'The viewing dist is');
+\ No newline at end of file