Problems and ExamplesDeighton, Bell and Company, 1862 - 141 strán (strany) |
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Strana 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 .
Strana 133
... lens , upon which parallel rays are incident , find the radius of a double equi- convex lens , which compounded with the former will refract the rays parallel . 4. The back of a double convex lens is quicksilvered ; if a small pencil of ...
... lens , upon which parallel rays are incident , find the radius of a double equi- convex lens , which compounded with the former will refract the rays parallel . 4. The back of a double convex lens is quicksilvered ; if a small pencil of ...
Strana 134
... 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 inches with a double con- ...
... 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 inches with a double con- ...
Strana 135
... lens , so that the image may be twice as great as the object and erect . 6. An object is placed at a distance of 4 inches from a concave lens of 2 inches focal length ; is the image erect or inverted ? 7. Two convex lenses , of 3 inches ...
... lens , so that the image may be twice as great as the object and erect . 6. An object is placed at a distance of 4 inches from a concave lens of 2 inches focal length ; is the image erect or inverted ? 7. Two convex lenses , of 3 inches ...
Strana 136
... lens , focal length 3 feet ; will this enable him to see distinctly at a distance of 12 feet ? If not , find the nature of the lens , which being interposed between his eye and the former lens will be sufficient for that purpose . 6 ...
... lens , focal length 3 feet ; will this enable him to see distinctly at a distance of 12 feet ? If not , find the nature of the lens , which being interposed between his eye and the former lens will be sufficient for that purpose . 6 ...
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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 sin² specific gravity sphere spherical square straight line string subtends surface tangent tower velocity vertex vertical
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