As the the title suggests, how is it that a little light they put on our finger when at the doctors/hospital/etc.. is able to tell us our blood oxygen levels?
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Atoms absorb different slivers of the visible light spectrum. So when light hits an object and bounces back off, some of it is left behind and makes it appear to be a certain colour.
This is how we know the universe is made up of the same atoms here on Earth, and how we know the composition of other planet’s atmospheres just by looking at them through a telescope.
It’s the same concept. The finger device measures the otherwise imperceptible colour of the wearer’s blood
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