Radiant Heat and Light 



'59 



FIG. 88. The sunlight is scattered (diffused) by the clouds. The photograph 

 shows in the foreground the Parliament Buildings, London, England. 



these droplets, it is reflected at all angles according to 

 the way it strikes, as shown in Figure 89. 



Some of the light is reflected back into the sky ; that 

 is why everything becomes darker when the sun goes 

 behind a cloud ; but much of the light comes through 

 to us, at all sorts of slants. When it comes all higgledy- 

 piggledy and crisscross like this, no lens can put it to- 

 gether again ; it is as hopelessly broken up as Humpty- 

 Dumpty was. But much of the light gets here just the 

 same ; so we see it without seeing the form of the sun. 

 Light that cannot be brought to a focus is called scattered 

 or diffused light. 



When you look through a ground-glass electric lamp, 

 you cannot see the filament ; the light passing through 



