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[–] 14408403? ago 

Don’t belittle your peers. This person is asking a questtion to educate himself/herself.

He's mocking Q and the OP above for using the word "optics".

We are researchers here. No respect, no time for some dumbfuck who can't even google a word.

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[–] 14632404? 0 points 1 point (+1|-0) ago 

I see. Sorry, I’m new here.