OCULARS FOR THE MICROSCOPE 



[Cn. I 



to form the real image, while the upper or eye lens acts with the eye 

 to form a retinal image of the real image (fig. 23, 24). 



Eye- Point 



FIG. 22 A. RAMSDEN OCULAR WITH THE REAL IMAGE BELOW AND THE 

 EYE-POINT ABOVE. 



Axis The principal optic axis of the ocular. 



d, ri The ocular diaphragm and the real image formed by the objective 

 below the lenses. 



Fl The field-lens of the ocular. 



El The eye-lens. 



Eye-point The eye-point in section and in face view, looking at the upper 

 end of the ocular. 



FIG. 22 B. POSITIVE COMPENSATION OCULAR. 



Axis The principal optic axis of the ocular. 

 d, ri The ocular diaphragm and the real image. 

 FL The field combination composed of three lenses. 

 EL The eye-lens. 



Eye-point The eye-point in section and as seen by looking down upon the 

 end of the ocular. 



