ON WINDOWS. 373 



equals the angle of reflection, therefore 

 the rays of the noon-day sun enter the 

 glass too perpendicularly for their reflec- 

 tion to be seen. 



Sun near noon. 



Sun near the horizon. 



Here AB represents a ray of the noon-day sun 

 striking the window at B ; its reflection will be at C : 



But DB (a ray of the rising or setting sun) will be 

 reflected to E (the eye of the spectator). 



TQ. Wliy can we not see the REFLECTION of 

 f/ieJsiiN in a WELL, during the day-time p 



A. Because the rays of the SUN fall 

 so obliquely, that they never reach the 

 surface of the water at all, but strike 

 against the brick sides. 



K a 



