376 REFLECTION ON WATER, 



THE SUN 



Here of the rays S A, S B, and S C, only the ray S C 

 meets the eye of the spectator D. 



The spot C, therefore, will appear luminous to the 

 spectator D, but no other spot of the water ABC. 



Q. At night the MOON seems to be reflected 

 from only ONE SPOT of a lake of water, while all the 

 REST seems DARK, WHY is this ? 



A. Because the rays (which fall at 

 various degrees of obliquity on the lake) 

 are reflected at similar angles; but as 

 only those which enter the eye of the 

 spectator will be visible, all the water will 

 appear dark but that one spot. (See 

 last figure.} 



Q. Why are MORE STARS visible from a 

 MOUNTAIN, than from a PLAIN ? 



