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Laser beam divergence and spot size
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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