Slit

Definition and stakes

Portrait of Arthur Conan Doyle Arthur Conan Doyle,  Round the Fire Stories

“ There was the faintest little rattle from the handle, and then I dimly saw a thin slit of subdued light. There was a lamp burning somewhere far down the passage, and it just sufficed to make the outside visible from the darkness of our room. The greyish slit grew broader and broader, very gradually, very gently, and then outlined against it I saw the dark figure of a man. He was squat and crouching, with the silhouette of a bulky and misshapen dwarf. ”
Source: Gutenberg

Various,  Scientific American Supplement…

“ When light falls upon a slit, such as we have here, it is turned out of its course; as the slit has two edges, and the light that falls on either side is deflected both right and left, the rays that cross from the right side of the slit toward the left, and from the left side of the slit toward the right, produce interference of the wave lengths, and when perfect interference occurs, dark lines are seen. ”
Source: Gutenberg

Portrait of John Tyndall John Tyndall,  The Glaciers of the Alps

“ Looking through this slit at a small and distant light, we find the light spread out in a direction at right angles to the slit, and if the light looked at be monochromatic, that is, composed of a single colour, we shall have a series of bright and dark bars corresponding to the points at which the rays from the different points of the slit alternately coincide and interfere upon the retina. ”
Source: Gutenberg

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