Re: Been thinking on this for a while
Having a think...
The limiting resolution of a record/stylus system would be about the size of an atom, say carbon for example, is 70pm, light 700nm (red) that's 10,000 times difference, no wonder optical systems are not as good for this application.
More, the wiggle of a record groove is about 70um i.e. about one million to one compared with a carbon atom. That's 60 dB not a bad approximation to the real world.
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