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Old Sep 5th 2014, 12:21 AM   #1
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Path differenece of light ray to produce first minima

for part a , in order to produce first minima from the central bright ray , the path differenece between 2 ray should be equal to λ/2 or 180 degree am i right? why the notes give the path
differenece = λ
...If path differenece = λ , the two light ray are in phase right? how can destructive intefrence occur?



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p/s : i have problem uploading the photo here
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Old Sep 5th 2014, 06:25 AM   #2
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Your photo is not available - perhaps you didn't provide appropriate permissions on your flickr account for all to view? I find it easiest to upload photos as attachments - click the paperclip symbol and select the file from your computer to upload.
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Old Sep 5th 2014, 09:39 AM   #3
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In order to get a minimum, you need to sum all phases from all the "rays" across the slit - from 0 to λ. That way, the rays from 0 to λ/2 will destruct with the ones from 0+λ/2 to λ/2+λ/2.
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