Natural Philosophy
Natural Philosophy
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In our eReader you can find the full English version of the book. Read Natural Philosophy 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 Natural Philosophy
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144.
Fig. I45 concave mirror M are reflected so as to form an image at the focus, and this image is viewed with the eyepiece o. As the image here is formed by reflected light the instru- ment is called a reflecting telescope. The ordinary tele- scope is called a refracting telescope, since the image is formed by refracted light.
The largest reflecting telescope ever made is the cele- brated one of Lord Rosse, which has a diameter of 6 feet and a focal length of 53 feet.
171. Parabolic Mirrors. ...The mirror shown in Figure 145 has what is called a parabolic surface, and is therefore called a para- bolic mirror. The point F is called the focus, and the line A X the axis, of the mirror. If parallel rays be allowed to fall upon such a mirror, they are reflected exactly to the focus F, whatever may be the breadth of the mirror. On the other hand, if a light be placed at the focus, its rays will be reflected from the mirror in parallel lines. This is be- 1 82 LIGHT.
cause the curvature of a parabolic surface is such that if a perpendicular be drawn to any point, as M, the angle which it makes with the line M L, drawn parallel to the axis, is equal to the angle it makes with the line M F drawn to the focus.
What to read after Natural Philosophy?
You can find similar books in the "Read Also" column, or choose other free books by Rolfe, W. J. (William James), 1827-1910 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
144.
Fig. I45 concave mirror M are reflected so as to form an image at the focus, and this image is viewed with the eyepiece o. As the image here is formed by reflected light the instru- ment is called a reflecting telescope. The ordinary tele- scope is called a refracting telescope, since the image is formed by refracted light.
The largest reflecting telescope ever made is the cele- brated one of Lord Rosse, which has a diameter of 6 feet and a focal length of 53 feet.
171. Parabolic Mirrors. ...The mirror shown in Figure 145 has what is called a parabolic surface, and is therefore called a para- bolic mirror. The point F is called the focus, and the line A X the axis, of the mirror. If parallel rays be allowed to fall upon such a mirror, they are reflected exactly to the focus F, whatever may be the breadth of the mirror. On the other hand, if a light be placed at the focus, its rays will be reflected from the mirror in parallel lines. This is be- 1 82 LIGHT.
cause the curvature of a parabolic surface is such that if a perpendicular be drawn to any point, as M, the angle which it makes with the line M L, drawn parallel to the axis, is equal to the angle it makes with the line M F drawn to the focus.
What to read after Natural Philosophy?
You can find similar books in the "Read Also" column, or choose other free books by Rolfe, W. J. (William James), 1827-1910 to read onlineMoreLess
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