REFLECTION. 379 



collect from the window sufficient rays to 

 enable them to see into the room. 



Q. Why do we often see the FIRE REFLECTED 

 in our parlour WINDOW in winter time ? 



A. Because glass is a good reflector; 

 and the rays of the fire (striking against 

 the window-glass) are reflected back into 

 the room again. 



Q. Why do we often see the shadow of our 

 CANDLES in the window, while we are sitting in our 

 parlour ? 



A. Because the rays of the candle 

 (striking against the glass) are reflected 

 lack into the room : and the darker the 

 night, the clearer the reflection. 



Q. WHY is this reflection more clear, if the 

 external AIR be DARK ? 



A. Because the reflection is not then 

 eclipsed by the brighter rays of the sun 

 striking on the other side of the window. 



Q. Why is the SHADOW of an object (thrown 

 on the wall) LARGER and larger, the CLOSER any 

 object be held to the CANDLE ? 



A. Because the rays of light diverge 

 (from the flame of a candle) in straight 

 lines, like lines drawn from the centre of 

 a circle. 



