Micro: 6 



OBJECTIVE 



Ullage plrr'f? vjnere 

 cliff ract-cl and direct 

 rays are reconibined 

 and interference 

 occurs 



phase shifting element 

 metallic absorbing 

 film 



bright direct rays 

 — weak diffracted rays 



diffraction of some 

 light by the specimen 



COwDEwaEK 



annular diaphragm 



Figure 1. 



Diagram of pnase contrast optics. Eyepiece is not snown 

 in tne illustration. 



