I was testing the focusing range on my iPhone by taking a close-up picture of the Apple logo on my computer. I was surprised to find that when the edges of the logo blurred, the metal reflection of my camera was still focused. So, I did a web search on how light reflects on mirrors. I found nothing of great significance, perhaps a few lines about the distance of light doubling in a mirror. It probably has all to do with photons, and unfortunately, I skipped physics. I am fascinated by this photo though, because I wonder if film cameras produce the same image.
Focus test 1 (Original from 2019 was lost then partially recovered, after another file with financial info disappeared)
Focus test 2 (August 2019)