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Jan 21, 2021 at 13:28 comment added Ilya Gazman Thank you, I have been struggling for weeks now, trying to understand this. I was missing the part that the image on the detector can be optically magnified.
Jan 21, 2021 at 13:24 vote accept Ilya Gazman
Jan 21, 2021 at 12:39 history answered Peter Erwin CC BY-SA 4.0