364 GENERAL SCIENCE 



QUESTIONS 



1. Why are lenses necessary for people who are near or far 

 sighted? 



2. Name some diseases which may be traced to defective eyes. 



3. Why are images formed on the retina of an eye? 



4. Why is it possible to focus so as to get an image of distant 

 and near objects? 



5. Why should people be very careful to have their eyes tested? 



6. How could one test for near and far sightedness? 



7. How is it possible to test for astigmatism? 



8. Why are people sometimes car-sick? 



9. How do people often abuse their eyes? 



10. What kind of lens is necessary to correct short sightedness? 

 Why? 



11. What kind of a lens is necessary to correct far sightedness? 

 Why? 



12. What is the advantage of the meniscus lens over the flat lens? 



13. What kind of light is best for the eyes? 



14. What kind of light should be avoided? 



15. How should lamps be placed for general use? 



16. Why do owls have difficulty in seeing during the day? 



17. Why do they see so well during night time? 



18. Why does the house seem, to be very dark after coming in 

 from outdoors where the sun is shining brightly on snow or sand? 



19. Do two eyes allow more light to enter than one eye? Give 

 reason for your answer. 



20. Why is it necessary to have two eyes? 



21. Why is the place where the optic nerve enters the eyeball 

 called the blind spot? 



22. Name some of the advantages of optical illusion which are 

 employed in dress? 



23. Should stout or thin people wear bow ties? Why? 



24. What kind of people should wear four-in-hand ties? 



