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Laser beam divergence and spot size
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1)What is LASER? 
  

2)As distance increases, what happens to the intensity of the laser beam?
  

3)What is the minimum value of the spot size of a laser beam along the beam axis called?
  

4)The relationship between beam width and divergence is due to:
  

5)The constant 'eta' is the characteristic impedance of the medium in which the laser beam is propagating. What isit's value for free space?
  


  


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