Notes of some properties of interferometric zone plate

The difference between a conventional and an interferometric zone plate ope ration has been described. It is known that the interferometric zone plate as an axis point source hologram possesses only two foci, whereas the conve ntional one possesses a large number of focal lengths, both positive and ne gative. In this letter, some imaging properties of the interference zone pl ate are shown, and the zones of gradual transitions from minimum and maximu m transmission are considered.