ON WATER. 375 



so oblique as those of the sun, they will 

 often reach the water. 



THE MOON OK A STAR 

 A 



Here the moon's rays A B, A C, both strike the water 

 D E, and are reflected by it. 



Q. In a sheet of water at noon, the sun 

 appears to shine upon only ONE spot, and all the 

 REST of the icater seems DARK, WHY is this ? 



A. Because the rays (which fall at 

 various degrees of obliquity on the water) 

 are reflected at similar angles; but as 

 only those which meet the eye of the 

 spectator are visible, all the sea will 

 appear dark but that one spot. 



Ka2 



