An Introduction to Physical Measurements, With Appendices On Absolute Electrical Measurement, Etc
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In our eReader you can find the full English version of the book. Read An Introduction to Physical Measurements, With Appendices On Absolute Electrical Measurement, Etc Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book An Introduction to Physical Measurements, With Appendices On Absolute Electrical Measurement, Etc
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To quickly assess the difficulty of the text, read a short excerpt:
The two radii of curvature, r and / of a lens, and the focal length, are related to each other and the refractive index of the sort of glass as follows : — -.= (,(4-1) (_ + -,),or/A = - — — -^+ 1.
"When a surface is concave its radius of curvature must be taken as negative.
(1.) The focal length of a convex lens may be measured by foiming with it an image of the sun on a plate of ground glass, and holding it at such a distance that the image is sharp and clear. The distance of the plate from th...e lens is the focal length.
(2.) Or the lens is placed before the object-glass of a telescope which has previously been focussed on some veiy distant object. Looking, now, through the lens with the telescope at some plane object (e.ff. a sheet of paper with writing on it), it will, a certain distance from the lens, be clearly visible. This distance is the required focal length.
(3.) The image formed by a lens of a near object may also be used to determine the focal length. On one side of the lens is placed a light, and on the other a white screen at such a distance that a clear image of the light is formed upon it.
What to read after An Introduction to Physical Measurements, With Appendices On Absolute Electrical Measurement, Etc?
You can find similar books in the "Read Also" column, or choose other free books by Kohlrausch, Friedrich Wilhelm Georg, 1840-1910 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The two radii of curvature, r and / of a lens, and the focal length, are related to each other and the refractive index of the sort of glass as follows : — -.= (,(4-1) (_ + -,),or/A = - — — -^+ 1.
"When a surface is concave its radius of curvature must be taken as negative.
(1.) The focal length of a convex lens may be measured by foiming with it an image of the sun on a plate of ground glass, and holding it at such a distance that the image is sharp and clear. The distance of the plate from th...e lens is the focal length.
(2.) Or the lens is placed before the object-glass of a telescope which has previously been focussed on some veiy distant object. Looking, now, through the lens with the telescope at some plane object (e.ff. a sheet of paper with writing on it), it will, a certain distance from the lens, be clearly visible. This distance is the required focal length.
(3.) The image formed by a lens of a near object may also be used to determine the focal length. On one side of the lens is placed a light, and on the other a white screen at such a distance that a clear image of the light is formed upon it.
What to read after An Introduction to Physical Measurements, With Appendices On Absolute Electrical Measurement, Etc?
You can find similar books in the "Read Also" column, or choose other free books by Kohlrausch, Friedrich Wilhelm Georg, 1840-1910 to read onlineMoreLess
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