498 THE OUTGO OF ENERGY 



Thus the enlargement of the retinal details is 

 less than with the direct method. When the 

 aerial image is viewed through the ophthalmo- 

 scopic lens of -f- 5 D, an enlarged virtual image 

 of the first image is formed, as in the microscope. 

 2. Draw constructions showing the formation 

 of the image in the direct and indirect methods. 

 Kemeinber that in the indirect method the rays 

 from the mirror come to a focus before reaching 

 the convex lens. Their second focus is in the 

 vitreous. 



