The picture below shows line 2.14, which is derived based on some of the discussion from the text above (I assume it's fairly obvious the experiment is Young's). My question is, why is there a proportionality instead of an equality? No amplitudes are mentioned for the constituent waves eminating from each of the slits, so I figure this should be an equality?
Also, some lines below, the sentence "Note that we are adding the wave amplitudes here." appears. I don't, however, see any amplitude additions. Is this a mistake for "..adding the wave expressions here"?
The Attempt at a Solution
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