Gilbert Light Experiments for Boys

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A.C. Gilbert Company, 1920 - Light - 126 pages
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Page 29 - The image seen in a mirror is always the same distance behind the mirror that the object is in front...
Page 111 - The magnifying power of a telescope is equal to the focal length of the objective divided by the focal length of the eyepiece.
Page 17 - ... that the intensity of light varies inversely as the square of the distance.
Page 73 - Descartes notices — and this seems to be the first step in the reduction — that "the determination of this [anaclastic] line depends on the relation between the angle of incidence and the angle of refraction
Page 111 - The lenses are separated by a distance equal to the sum of their focal lengths and the magnification is the ratio of the focal lengths.
Page 88 - This is to be expected as we have already shown that white light is made up of all the colors of the spectrum from red to blue.
Page 28 - The image appears to be as far behind the mirror as you are in front of it.
Page 102 - If the object is at a distance from the lens greater than the focal length (1, Fig.
Page 16 - Use a short flash for a dot and a long flash for a dash.
Page 109 - The lens nearest the object is called the objective, and the lens nearest the eye, the eyepiece.

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