D = 10 meters,   lambda = 5000 Angstroms  

           theta_critical  =  6.1 x 10^(-8) radians   =  0.013 arcsec


  
    D = 10 meters,   lambda = 22000 Angstroms  =  2.2 microns

           theta_critical  =  2.7 x 10^(-7) radians   =  0.055 arcsec