Problems and ExamplesDeighton, Bell and Company, 1862 - 141 pages |
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Page 65
... focal chord as diameter touches the directrix . 24. From a point T two tangents TP , TQ are drawn to a parabola , shew that the angles PST , QST are equal ; also shew that the ... focus and the length of the axis CONIC SECTIONS . 65.
... focal chord as diameter touches the directrix . 24. From a point T two tangents TP , TQ are drawn to a parabola , shew that the angles PST , QST are equal ; also shew that the ... focus and the length of the axis CONIC SECTIONS . 65.
Page 66
... length of the axis major ; describe an ellipse touching two given straight ... focal distances of the extremities of the axis minor have a greater ... focal chord , X the foot of the directrix corresponding to the focus S , XP , XQ are ...
... length of the axis major ; describe an ellipse touching two given straight ... focal distances of the extremities of the axis minor have a greater ... focal chord , X the foot of the directrix corresponding to the focus S , XP , XQ are ...
Page 132
... LENS . 1. An object 10 feet below the surface of water , is viewed by an eye 15 feet above the surface . What is the focal length of a lens through which it must be viewed , 132 OPTICS .
... LENS . 1. An object 10 feet below the surface of water , is viewed by an eye 15 feet above the surface . What is the focal length of a lens through which it must be viewed , 132 OPTICS .
Page 133
... focal length of the compound lens . 7. Four lenses having a common axis are placed at intervals 1 , 5 , 10 inches from each other , the focal length of each of the first three being 5 inches , and of the last 1 inch . If a pencil of ...
... focal length of the compound lens . 7. Four lenses having a common axis are placed at intervals 1 , 5 , 10 inches from each other , the focal length of each of the first three being 5 inches , and of the last 1 inch . If a pencil of ...
Page 134
... focal length of the lens , which causes rays diverging from a point at a distance of 2 feet to diverge as if from a distance of 3 feet . 12. What single lens is equivalent to a combination of a double convex lens of focal length 2 ...
... focal length of the lens , which causes rays diverging from a point at a distance of 2 feet to diverge as if from a distance of 3 feet . 12. What single lens is equivalent to a combination of a double convex lens of focal length 2 ...
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2nd Edition 3rd Edition 4th Edition acceleration tending arithmetical arithmetical mean arithmetical series bisected centre of gravity chord circle concave cone Conic Sections conjugate convex lens Crown 8vo cylinder determine diameter directrix distance drawn Elementary ellipse English equal equation extremity F. A. Paley Fcap feet Find the number find the value fluid focal length foci focus geometrical progression given point given weight harmonic mean horizontal inches incident inclined plane inscribed intersection Latin latus rectum locus luminous point middle point mirror Multiply parabola parallel particle describes passing perpendicular position Post 8vo pressure prism projected prove pully quantity radii radius ratio reflected refracting respectively shew sides sinČ specific gravity sphere spherical square straight line string subtends surface tangent tower velocity vertex vertical
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