278 GENERAL SCIENCE 



doors, cracked glass, and waves of water will produce 

 refraction of light so that the rainbow colors can be seen. 



QUESTIONS AND EXERCISES 



1. What kind of objects can be seen? Which kind cannot be 

 seen? 



2. To have properly lighted rooms, what color of paper 

 should be on the walls? Why? 



3. What practical uses are made of lenses? 



4. Bring your camera to school and learn the use of its parts 

 so you can take better pictures. 



5. What time of the day are most rainbows seen? Why? 

 What is the arrangement of the colors of a rainbow? 



6. How can rainbow colors be produced on a clear day? 



