Double-Slit Experiment

https://www.youtube.com/watch?v=GfaR8625H7o&list=PLTjLwQcqQzNKzSAxJxKpmOtAriFS5wWy4
00:00 A bit of history
02:06 Setup of the double slit experiment
02:20 What is observed in the double slit experiment?
03:36 Interference and wave path difference
05:19 Interference pattern explained
11:30 Derivation (formula for wavelength)
More: https://en.fufaev.org/double-slit