REFRACTION 



51 



r.h. 



-20 



-18 



-16 



-14 



-12 



-10 



-8 



-6 



-4 



-2 



=tO 



2 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



14 



15 



16 



10 



20 



30 



40 



50 



Table 2 

 M 



v> 

 60 



70 



80 



90 



100 



r.h. 



10 



20 



30 



40 



Table 2 (Continued) 

 M 



50 



60 



70 



80 



90 



100 



