SHADOWS IN WATER. 



371 



angle of incidence ; and GA, KA and HB, LB are 

 the lines of the angle of reflection. When the arrow 

 is at C D, its shadow will appear at G H, because the 

 line C A=GA and the angle C AB=angle GAB, &c.; 

 and the same may he said about the point D. 



Q. Why can a man see his WHOLE PERSON 

 reflected in a LITTLE MIRROR not 6 inches in length ? 



A. Because the line of the angle of 

 incidence is always equal to the line and 

 angle of reflection. 



Take the last figure C D is much larger than the 

 mirror A B ; but the head of the arrow C is reflected 

 obliquely behind the mirror to G; and the barb D 

 appears at H. Why? Because the line CA=AG 

 and the angle C A B=angle GAB, &c. The same may 

 be said of the point D. 



Q. Why does a SHADOW in WATER always 

 appear TOPSY-TTJRVY? 



A. Because the line of the angle of 

 incidence is always equal to the line and 

 angle of reflection. 



Here the arrow-head A strikes the water at F, and 



