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" Find the geometrical focus of a pencil of rays after direct refraction at a spherical surface. "
Calendar, for the Year ... - Page xli
1895
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A Treatise on Optics

William N. Griffin - Ophthalmology - 1838 - 206 pages
...the mirror ; if the mirror be convex it will be also towards the surface. 32. To find the geometrical focus of a pencil of rays after direct refraction at a spherical surface. Let Q (fig. 17) be the origin of a pencil of light whose axis QA is incident directly on a spherical...
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The London University Calendar

London univ - 1846 - 326 pages
...15.— Morning, lOtol. OPTICS— HEAT— ASTRONOMY. Examiner, Mr. JERRARD. 1 . Find the geometrical focus of a pencil of rays after direct refraction at a spherical surface. 2. A pencil of light passes centrically with small obliquity through two thin lenses in contact, to...
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A Collection of Problems and Examples Adapted to the "Elementary Course of ...

Harvey Goodwin - Mathematics - 1851 - 196 pages
...vertex upwards and axis vertical ; determine the density of the air contained in the hollow cone. 2J. A sphere composed of two hemispheres of different...is placed in the path of a pencil of light in such manner that the axis of the pencil is perpendicular to the plane of junction and passes through the...
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The Principles of the Solution of the Senate-house 'riders,' Exemplified by ...

Francis James Jameson - Mathematics - 1851 - 144 pages
...feet deep to a person looking directly down upon it. (fj, = -f for water.) (A). Find the geometrical focus of a pencil of rays after direct refraction at a spherical refracting surface. (B}. Rays are incident parallel to the axis on a glass cylinder with hemispherical...
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A Treatise on Optics

Stephen Parkinson - Optics - 1859 - 336 pages
...meet the surface in the same point; find the angle of incidence when p = -—-— . , 3 + ^5 m 35. A sphere composed of two hemispheres of different...determine the geometrical focus of the refracted pencil. 36. Find the geometrical focus of a pencil of rays refracted through a hollow glass sphere, whose external...
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The Elements of Natural Philosophy; Or, An Introduction to the Study of the ...

Golding Bird, Charles Brooke - Physics - 1867 - 894 pages
...normal to the surface ; otherwise the refraction is said to be oblique. In order to find the geometrical focus of a pencil of rays after direct refraction at a spherical surface, let r, Fig. 579, be the origin of a pencil of light in- p • 579 cident directly on a spherical refracting...
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Report of Her Majesty's Civil Service Commissioners: Together ..., Volume 20

1876 - 586 pages
...MATHEMATICS. (B.) Professor HJS SMITH. Wednesday, 24th March 1875. 10 AM to 1 PM 1. Find the geometrical focus of a pencil of rays after direct refraction at a spherical surface. A, B, are two radiant points situated very near to one another on the axis of a concave spherical mirror...
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The Madras University Calendar, Volume 1

University of Madras - 1876 - 580 pages
...? IX. Show that there cannot be more than three lunar eclipses in the year. X. Find the geometrical focus of a pencil of rays after direct refraction at a spherical surface. o Ex. refractive index = - ; rays incident on a concave mirror whose radius is 5 ft.; distance of the...
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Solutions of the Cambridge Senate-house Problems and Riders for the Year 1875

Sir George Greenhill - Mathematics - 1876 - 318 pages
...see the image F' shut, and if E be shut, F will see the image E' shut viii. Determine the geometrical focus of a pencil of rays after direct refraction at a spherical refracting surface. A hollow globe of glass has a speck on its interior surface, if this be observed...
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University of Oxford. Examination of women. Examination papers

Oxford univ, local exams - 1885 - 358 pages
...and are proportional to the times of describing them. Optics and Astronomy. 4. Find the geometrical focus of a pencil of rays after direct refraction at a spherical surface, and trace the relative changes of position of the conjugate foci. 5. A plane surface touches a self-luminous...
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