32 LIGHT 



of milk in it? Why? Add some more milk and tell 

 what color the water becomes. When only a little light 

 is reflected what color is reflected? Why is the sky bine? 

 If all the light is reflected what color is it? 



c. Notice the amount of light upon the ceiling. Xow 

 hold a sheet of white paper in the sunbeam and tell what 

 change there is in the amount of light. The moon shines 

 by light reflected from the sun, so moonlight is only sun- 

 light which has gone to the moon before coming to us. 



Review Questions, 8. 



1. Face the north. After turning 135 to the right, 

 in what direction are you facing? If you had turned to 

 the left, in what direction would you be facing? 



2. If the sun is in the south direction every day in 

 the year, at noon, how can the sun be farther south in 

 winter than in summer? 



3. If the sun sets at quarter before seven o'clock, 

 at vvhat time will it rise next day? 



4. What is the best manner of finding the line which 

 is half-way between the shadows in Experiment 3? 



5. What is the cause of freckles? Why do not all 

 persons become freckled? 



6. If you looked at a very large and very bright 

 mirror would you see the mirror? Explain. 



7. How do you see other persons? Do they give 

 light? 



8. If you are five feet in front of a mirror and then 

 move three feet nearer, how much nearer are you to your 

 image? 



9. Why are shades used over lamps and other 



lights? 



