2 go 



OUR PHYSICAL WORLD 



surface. When, therefore, they are produced back of the mirror 

 to meet at the point d', they meet nearer the mirror than is d. 



d' 



FIG. 136. Reflection from a convex mirror. The image of the large arrow 

 at the right is seen by the eye at the left and is relatively small. 



Similarly, e' is nearer the mirror than e, and d f and e' are closer 

 together. The image of the arrow is, therefore, smaller than the 

 arrow itself. An observer, seeing himself in such a cylindrical 



B 



FIG. 137. Images of a man: A, as seen in a convex cylindrical mirror; B, as 

 seen in a plane mirror; C, as seen in a concave cylindrical mirror. D, Diagram 

 showing why the concave mirror broadens the face. 



mirror when its long axis is parallel to his height, will see himself 

 narrowed from side to side while his vertical size will be 

 unchanged. 



If now one looks at himself in the concave surface of a 

 cylindrical mirror when its long axis is parallel to his height, 



