Malus’ Law and Light Intensity: 5-Minute Quantum Physics

A tutorial on Malus’ law and where it comes from. Malus’ law enables us to predict how the intensity of a beam of polarized light will change as it passes through polarizing filters. Even if basic old optical laws don’t interest you, it’s worth studying this stuff, since we’re going to move on to looking at how this whole thing works when we start claiming that light is made up of photons, which is going to be quite interesting.

This is the first tutorial I’ve published in a while … thanks for your patience if you’ve been waiting for it, and many thanks to those few who emailed me and asked when the next tutorial was due!

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