## Problems and ExamplesDeighton, Bell and Company, 1862 - 141 pages |

### From inside the book

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Page 133

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**convex lens**, the visual angle is the same whatever is the distance of the eye from the glass . 3. Given the radii of a thin double concave lens , upon which parallel rays are incident , find the radius of a double equi-**convex lens**... Page 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

... 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 ... Page 135

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**convex 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 ... Page 137

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**convex lens**to be placed between them at a distance of one inch from the eye - glass , and of twice its aperture , that the field of view may be doubled , when adapted to common eyes . The field of view may be sup- posed to be measured ... Page 140

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**lens**which are in harmonical progression . 12. A ray of light falls on the**convex**surface of a hemi- spherical**lens**in a direction parallel to its axis , is reflected at the plane surface , and emerges through the**convex**; prove that ...### Other editions - View all

### Common terms and phrases

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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