PROGRESS IN MICROSCOPY 



Fig. 1.4. Airy disk. 



Positions of the black rings are shown to correspond to Z =- 3 83 

 702 1017... and positions of peaks to Z = 514 846 11-62... 

 Peak intensities are 1 0175 0042 00016. 



Fig. 1.5. Light distribution in tiic Airy disk. 



The first dark ring corresponds to Z =^ 3-83; therefore, the linear 

 radius Q of the central diffraction in the image plane tz can be cal- 



