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+//Example 2.19 //Angular sepration

+clc;

+clear;

+//given data

+n=1;// order of spectrum

+wi=.5;// width of grating in cm

+N=2500;//total no. of lines 

+c=wi/N;//grating element

+w1=589D-7;// first wavelength of sodium in cm

+//part a

+theta1=asin(n*w1/c)//angular width in radian

+theta1=theta1*180/%pi;//angular width in degree

+disp(theta1,"angular width in degree")

+w2=5896D-8;//second wavelength of sodium in cm

+//part b

+theta2=asin(n*w2/c)//angular width in radian

+theta2=theta2*180/%pi;//angular width in degree

+disp(theta2,"angular width in degree")

+theta=theta2-theta1;//angular sepration degree

+disp(theta,"angular sepration in degree")

+w=(w1+w2)/2;//mid wavelength

+dw=6D-8;// change of wavelength in cm

+n=1;//order of spectrum

+N=w/(n*dw);//no. of lines will appear

+N=floor(N);// N should be integer

+if(1/c>N)

+    disp(N,"No. of lines will appear")

+else

+    disp("they can not be seen differently ")

+end