- #1

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http://www.flickr.com/photos/[email protected]/5203631379/sizes/l/in/photostream/

I understand this formula 36.5 because the only variable in intensety is E and since 36.4 (from the text) has mesaured the new E you can see that the only difference between the new and the maximum field is what is after E

_{0}in36.4

But then it says that what is the I for a point when there are two slits and the I in a point in one lsit is affected from the waves from both. I don't see how this works. They use the formula for intensity for two rays found from a phasordiagram which in the end gives the formula 35.10 (shown in link below):

http://www.flickr.com/photos/[email protected]/5203688911/sizes/l/in/photostream/

where I

_{0}is found from formula for intensity with E from two waves:

http://www.flickr.com/photos/[email protected]/5203700111/sizes/l/in/photostream/