132 



MAGNIFICATION BY THE MICROSCOPE 



CCh. V 



Axis The principal optic axis of the 

 /, / Principal focus of the objective, 



formed by the objective just 



the ocular. 



cr The cornea of the eye. 

 rs The single refracting 

 / The crystalline lens of 

 r i The retinal image; it 

 The tube length of the mi- 



limeters, and the image dis- 



250 millimeters. For more 



fig. 20. 



microscope and of the eye. 

 and of the ocular, r im, the real image 

 above the principal focus of 



surface of the schematic eye. 

 the eye. 

 is erect. 



croscope (fig. 25) is 160 mil- 



; tance of the virtual image, 



complete explanation see 



Virtual 



Fig. 78. Compound Microscope Showing All the Images. 



