Infinity sign on lenses

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AndrewF posed:
"You've all seen the flat eight on your lens - know who 'invented' it?"

I have seen it but do not know who decided that it would be the infinity 
sign in optics. It is a Greek letter so maybe there is a good story to go
along with this! It would be a great question for an exam if it had a good 
answer.

Andy


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