We represent the interference of waves we observed yesterday by using the diagram above. We shined a laser through two slits. This diagram captures distances relevant to the resulting interference patterns we saw on the wall. The distance d is the distance between the two slits, S1 and S2, and we designate it as "d." AS2 is the difference in the lengths of the paths light takes as it goes from S1 to point P and from S2 to point P.
We infer the path length difference between PS1 and PS2 when we look at the interference pattern. If P is on the first antinode from the central antinode, we know that the path length difference between the paths from S2 and S1 to P will be one full wavelenth. [You know why, don't you?] We represent that path difference in the picture above with AS2. Assignment:
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Physics IIMr. Swackhamer Archives
May 2019
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