In case you have never seen an actual double slit before…
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Here’s an explanation on the formation of the double slit interference pattern.
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Category: 10 Superposition
Two-Source Interference Applets
👨 This video helps you to understand the formation of the interference pattern.
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You can play with the applets yourself.
🍏 https://ngsir.netfirms.com/englishhtm/Interference.htm
🍏 https://ngsir.netfirms.com/englishhtm/Interference2.htm
🍏 https://www.walter-fendt.de/html5/phen/interference_en.htm
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Path Difference
Path difference determines the phase difference, which in turn determines the whether we get constructive or destructive interference.
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The following animations illustrate the outcome under difference path differences.
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Path difference = 2λ
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Path difference = 1.5λ
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Path difference =0.5λ
Superposition of 2 Sinusoids
Phase difference decides whether we get constructive or destructive interference.
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For your viewing pleasure, here is a stack of slides show the outcome of superposing two sinusoidal waves, at different phase differences ∆θ. Best viewed with this PDF under “fit-to-page” mode.
xmPhysics 