Wave interference simulator: ripple tank

Two dippers make waves that overlap. Change the wavelength and spacing to see where they add up and where they cancel, with the path-difference rule.

Learn interference properly

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Questions students ask

When is there constructive interference?

Where the path difference is a whole number of wavelengths, nλ.

How far apart are the fringes?

About λD/d, for slit or source separation d and screen distance D.

Free notes on interference

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