File:EB1911 Vision - Experiment of Scheiner.jpg
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current | 23:03, 28 August 2021 | 879 × 274 (56 KB) | Bob Burkhardt | {{Information |description = {{en|1=Diagram of experiment of Scheiner: Let C be a lens, and DEF be screens placed behind it. Hold in front of the lens a card perforated by two holes A and B, and allow rays from a luminous point ''a'' to pass through these holes. The point ''o'' on the screen E will be the focus of the rays emanating from ''a''; if ''a'' were removed farther from the lens, the focus would be on F, and if it were brought near to C, the focus would then be on D. The screens F a... |
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