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+//chapter 4

+//example 4.1

+//Find spacing constant

+//page 75

+clear;

+clc;

+//given

+lambda=2.6; // in Angstrom (wavelength)

+theta=20; // in Degree (angle)

+n=2;

+//calculate

+lambda=lambda*1E-10; // since lambda is in Angstrom

+// Since 2dsin(theta)=n(lambda)

+// therefore d=n(lambda)/2sin(theta)

+d=n*lambda/(2*sind(theta));

+printf('\nThe spacing constant is \td=%1.1E m',d);

+d=d*1E10; // changing unit from m to Angstrom

+printf('\n\t\t\t\td=%.1f Angstrom',d);