Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 110
ints wouldso overlap that there would result merely anilluminated surface, as you can readily see if youremove the cardboard (B). When this screenis in place, only a single ray can pass through thehole from each point, say D-D, for instance.All the others from that point, as D-E, D-F,D-G, D-H,… … FIG. I. diagram to show course of the rays. is also the case with the millions of points form-ing the surface of the candle. This pinhole does not let enough light through,but if we make it larger so many rays comethrough from the same point as to blur theimage. To use a larger opening we need a…
Children's literature
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