410 A YEAR IN SCIENCE 



8. How is the eyeball protected? 



9. Name and describe the parts of the eye. 



10. What is the nature of light? 



11. Explain how the rays of light are bent in 

 passing through a convex lens. 



12. "What is an image? Where must the image fall 

 in the eye if the object is seen? 



13. Explain what is meant by accommodation. 



14. How may shortsightedness and farsightedness 

 be remedied? 



15. What is astigmatism? 



16. Give some points in reference to the care of the 

 eyes. 



17. What is the structure of the external ear ? The 

 middle ear? The internal ear? 



18. What is the nature of sound? 



19. How are sound waves transmitted through the 

 ear to the auditory nerve? 



20. Of what use are the semicircular canals? 



21. Why do colds sometimes affect the ear! 



