COLOR AND CHEMICAL ACTION OF LIGHT 383 



QUESTIONS 



1. Why do yellow and blue crayon powdered together look green; 

 red and yellow crayon powdered together look orange? 



2. Why are some blues and greens indistinguishable from each 

 other by candle light? 



3. Why is it preferable to select colored material by daylight? 

 (When you wish a perfect match, the test should be made both by 

 daylight and by artificial light.) 



4. Why do street lights, when viewed through a wire screen or a 

 thin silk curtain, appear to have rays in four directions fringed with 

 rainbow colors? 



5. Why may the color of a dewdrop on which the sun is shining 

 be made to change by changing the position of the head? 



6. Why do people look ghastly in the light of the flaming arc? 



7. Why is the sun red at rising and at setting? 



8. Why is the foam of a muddy street white? 



9. In the peacock's tail, and on many butterflies where brilliant 

 colors are seen, there is no coloring matter in the feathers or scales. 

 Explain this. 



10. Why does a blue sky look green when viewed through yellow 

 glass? 



11. Why do you see a bluish-green light if you turn your gaze 

 toward a white wall after looking steadily at a bright red light? 



12. What is an " after image "? What causes it? 



13. Why does blue cloth look nearly black in gas light? 



14. Why is snow white? 



15. Why is foam white? 



16. Why is the ocean blue? 



17. Why does molasses candy whiten on being pulled? 



18. What part of this chapter is of greatest value to you? Why? 



19. Make a list of the important things in the order in which you 

 consider them of value to you. 



