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+//Example 2.8 //angular separtion

+clc;

+clear;

+//part a

+c=1/5000;//grating element

+w1=5890D-8;// in first case first wavelength used in cm

+n=2;//order of spectrum

+theta=asin((n*w1)/c);//angular separton in radian

+theta=theta*180/%pi;//to convert in degree

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

+//part b

+w2=5896D-8;// in second case second wavelength used in cm

+n=2;//order of spectrum

+theta1=asin((n*w2)/c);//angular separton in radian

+theta1=theta1*180/%pi;//to convert in degree

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

+a=theta1-theta;//angular separation in degree

+disp(a,"angular separation in degree")

+//part c

+w=5893D-8;// mid wavelength

+dw=w2-w1;// change in wavelength

+n=2;//order of spectrum

+N=w/(dw*n);//no. of lines in grating

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

+disp(N,"no. of lines in grating")

+