192 REFLECTION. 



CHAPTER XV. 

 3._REFLECTION OF HEAT. 



Q. What is meant by REFLECTING HEAT ? 



A. To reflect heat, is to throw it back 

 in rays from the surface of the reflecting 

 body, towards the place from whence it 

 came. 



Q. What are the BEST REFLECTORS of heat ? 



A. All bright surfaces, and light 

 colours. 



Q. Are GOOD ABSORBERS of heat GOOD 



REFLECTORS also ? 



A. No; those things which absorb 

 heat best, reflect heat worst ; and those 

 which reflect heat worst, absorb it best. 



Q. Why are those things which ABSORB HEAT 

 unable to REFLECT it ? 



A. Because if any thing sucks in 

 heat like a sponge, it cannot throw it off 

 from its surface ; and if any thing throws 

 of heat from its surface, it cannot drink 

 it in. 



Q. Why are REFLECTORS always made of 

 LIGHT-COLOURED and highly POLISHED METAL ? 



