28 



LIGHT 



with waxed paper, or paper with grease on it. Make a 

 hole with a pencil point in the end of the box which is 

 opposite the paper. Both cameras may be used in the 

 same way, but the first one will give better images. 



c. Turn the pin-hole end of your camera toward 

 the objects you wish to see in the camera. Bright ob- 

 jects are the best for this purpose. Cover the head and 

 the other end of the box with a cloth, or a jacket, and yon 

 will see an image in all its natural colors. Where is the 

 top of the image? Where is the right side of the image? 

 How do you explain this result? 



Review Questions, 7. 



1. If you look along the surface of a body of water 

 and then look exactly overhead, through how many de- 

 grees have you tipped your head? 



2. If plants die, will the sun make the leaves green? 

 What besides the sunlight is necessary in order that the 

 plants be green? 



3. What is the use of tan upon the skin? 



What is the harm of using chemicals to bleach 



4. 

 cloth? 



5. 

 them? 



How do plants show that sunlight is good for 



