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+//Optoelectronics - An Introduction, 2nd Edition by J. Wilson and J.F.B. Hawkes
+//Example 1.3
+//OS=Windows XP sp3
+//Scilab version 5.5.2
+clc;
+clear;
+
+//given - Case(1)
+D=0.1;//diameter of an objective lens in m
+d=500;//distance of the lens from the sources in m
+lambda=550e-9;//wavelength of the light used in m
+
+Smin=d*lambda/D;//minimum separation of two point sources that can just be resolved in m
+mprintf("Smin = %.2f mm",Smin/1e-3);//division by 10^(-3) to convert into mm
+
+
+//given - Case(2)
+p=1;//order of the fringe
+N=600;//number of lines used per mm
+lambda=550e-9//wavelength of the light used in m
+w=40//width of the diffraction grating in mm
+
+DeltaLambda=lambda/(p*N*w);//minimum wavelength difference that can be resolved in m 
+mprintf("\n DeltaLambda = %.3f nm",DeltaLambda/1e-9);//division by 10^(-9) to convert in nm