Radiant Heat and Light 151 



Experiment 41, but this time move the lens from near 

 the candle toward the paper, past the point where it 



sclerotic coat 



muscles 



FIG. 79. A section of the eye. 



makes its first clear image. Keep moving the lens 

 slowly toward the paper until a second image is formed. 

 Which image is larger than the flame? Which is 

 smaller? 



The important point in this experiment is for you to 

 see that if the lens is nearer to the image on the paper 

 than it is to the candle, the image is smaller than the 

 candle. That is why a photograph is usually smaller 

 than the thing photographed; it would be impossible 

 to take a picture of a house or a mountain if the lens in 

 the camera gave a magnified image. 



1 Your eye is a small camera. It has a lens in the 

 front ; it is lined with black ; and at the back there is 



1 The following explanation may be omitted by any children who are 

 not interested in it. Let such children skip to the foot of page 156. 



