8 



PROPERTIES OP LENSES. 



Fig. 5. 



If nearer, a real inverted magnified image is formed 

 at increasing distance until the principal focus is 

 reached, when no image is formed on the screen, 

 because the rays can never come to a focus being 

 parallel. 



Fig. 6. 



The human eye consists of a convex lens, the 



Fig. 7. 



