INTERFERENCE MrCROSCOPY IN TRANSMITTED LIGHT 99 









Fig. 3.6. Living fibroblast from mouse heart in tissue culture by bright-field interference 

 contrast, x 1700. Dr. H. G. Davies, King's College (courtesy of Cooke, Troughton 



and Simms). 



to the surface Xsx!^. The light-ray cone converging in A on to the 

 object, converges anew in A' in an area where the reflecting metal 

 layer was removed beforehand. 



Therefore, A is efficiently imaged at A' as phenomena occur as 

 if A were in the centre of the sphere FA'F' and, of course, a sphere is 

 stigmatic in its centre. 



