Self-Photography In Mirror
"If I take my own photograph in a mirror, should Lfocus on the mirror or allow for a greater distance?" writes a camera fan to the Science Question Box department of General Electric. ✓ "Focus and allow for a distance twice that of the mirror from you," the experts say. Focus is determined by the distance that light rays have to travel from the object to the lens. In this case they have to go from you to the mirror and back again.
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https://paperspast.natlib.govt.nz/newspapers/BPB19481103.2.37
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Bay of Plenty Beacon, Volume 13, Issue 15, 3 November 1948, Page 6
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85Self-Photography In Mirror Bay of Plenty Beacon, Volume 13, Issue 15, 3 November 1948, Page 6
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