378 REFLECTION. 



D E G represents the air or atmosphere around the 

 earth. 



Because E C is longer than D C, therefore the rays of 

 the sun at M pass through more air than the rays of the 

 sun at S, and the sun is more magnified. 



Q. Why does the RISING and SETTING MOON 

 appear so much LARGER, than after it is risen higher 

 above our heads ? 



A. Because the earth is surrounded 

 by air, which acts like a magnifying glass ; 

 and when the moon is near the horizon 

 (as its rays pass through more of this 

 air) it is more magnified. (See last 

 figure.) 



Q. When CANDLES are LIGHTED, we CANNOT 

 SEE into the STREET or road, WHY is this ? 



A. 1st Because glass is a reflector, 

 and throws the candle-light back into the 

 room again; and 



2ndly The pupil of the eye (which 

 has become contracted by the light of the 

 room) is too small to collect rays enough 

 from the dark street, to enable us to see 

 into it. 



Q. Wliy can persons in the street SEE into a 



WELL-LIGHTED ROOM ? 



A. Because the pupil of their eyes is 

 much dilated by the dark, and cannot 



