DEVELOPMENT OF CONVEX AND CONCAVE LENS 



343 



QUESTIONS 



1. Why does a " bull's-eye light " look very large? 



2. Why do fish look large in a globe-shaped aquarium? 



3. Why does fruit preserved in cylindrical glass jars look large? 



4. Why is it possible to see 

 the sun before it is up? 



5. Why does the moon look 

 much larger on the horizon 

 than it does higher up? 



6. When looking at fish in 

 water, is the fish which you see 

 larger or smaller than the real 

 fish, nearer to or farther from 

 the surface? 



7. Why do objects look 

 broken or irregular through a 

 window-pane ? 



8. Does a stick in water 

 look larger or smaller, straight 

 or broken? Why? 



9. Why are prismatic colors 

 sometimes seen at the edge of 

 window-panes? 



10. Why does an " Indigo 

 red sky " signify rain? 



11. Why are condensers 

 used in a stereopticon? 



12. When do you know that 

 the light in a stereopticon is 



placed at the right distance FIG. 221. A compound microscope. Oi 



is the object. O 4 shows how much 



from the condensers? 



13. Why should people be 

 careful about leaving broken 

 bottles in woody places, where 

 there are dry leaves, sticks, 



larger the object looks. What do you 

 think causes the object to form such 

 a large image? 



etc.? 



14. Is the image on the ground glass of a camera real or virtual? 



