132 



MAGNIFICATION BY THE MICROSCOPE 



[CH. V 



Axis The principal optic axis of the microscope and of the eye. 



/, / Principal focus of the objective, and of the ocular, r im, the real image 



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. 



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. 



