Optics Without MathematicsSociety for promoting Christian knowledge, 1883 - 124 páginas |
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Página 16
... plane . We must mind our spelling , and not write " plain . " The words are akin , but plane has an especial meaning . It means a It means a perfectly flat surface , great or small , and lying in any direction . A swing looking - glass ...
... plane . We must mind our spelling , and not write " plain . " The words are akin , but plane has an especial meaning . It means a It means a perfectly flat surface , great or small , and lying in any direction . A swing looking - glass ...
Página 17
... plane , but concave or hollow like a cup , or convex , that is , rounding , what will happen then ? The same law will hold good . An ex- cessively short portion of a curved line may be considered straight for practical purposes , and ...
... plane , but concave or hollow like a cup , or convex , that is , rounding , what will happen then ? The same law will hold good . An ex- cessively short portion of a curved line may be considered straight for practical purposes , and ...
Página 18
... plane mirror . If parallel rays , such as sun- or moonlight , fall upon it , they will be reflected parallel as before . This will be evident from the consideration that in the first figure P represents any point in the mirror , and ...
... plane mirror . If parallel rays , such as sun- or moonlight , fall upon it , they will be reflected parallel as before . This will be evident from the consideration that in the first figure P represents any point in the mirror , and ...
Página 19
... plane mirror , though too often a very imperfect one , from defects in material or workmanship . Every radiant in front of it is seen by reflected rays , which enter the eye as though they diverged in the same way from a radiant placed ...
... plane mirror , though too often a very imperfect one , from defects in material or workmanship . Every radiant in front of it is seen by reflected rays , which enter the eye as though they diverged in the same way from a radiant placed ...
Página 21
... plane mirrors . They are often employed to increase the apparent size of shops and rooms . Two placed against opposite walls will reflect the back and front of intervening objects alter- nately to an interminable distance ; and a small ...
... plane mirrors . They are often employed to increase the apparent size of shops and rooms . Two placed against opposite walls will reflect the back and front of intervening objects alter- nately to an interminable distance ; and a small ...
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Términos y frases comunes
angles of incidence aperture axis beautiful called candle circle cloth boards colour concave lens concave mirror conjugate foci converging convex lens course crossing crystal crystalline lens curious curves dark direction dispersion distance Double Refraction edge equal angles equi-convex eye-lens Fcap feet focal image focal length form an image fraction front happens hole inches larger lenses look looking-glass magnifying power microscope minute moon Newtonian reflector NORTHUMBERLAND AVENUE object object-glass opposite optical parallel rays perfect perfectly picture plane mirror polarised position prism produce PROMOTING CHRISTIAN KNOWLEDGE properties of light proportion radiant radius rainbow ray passes reflected rays reflecting telescopes refraction retina reverse right angles seen shorter focus side sideways sine Sir EDMUND BECKETT spectrum speculum sphere spherical spherical aberration straight line suppose surface telescope thing tion turned undulations violet waves wonderful
Pasajes populares
Página 125 - ANCIENT HISTORY FROM THE MONUMENTS. This Series of Books is chiefly intended to illustrate the Sacred Scriptures by the results of recent Monumental Researches in the East. Fcap. 8vo, cloth boards, 2s. each. Assyria, -from the Earliest Times to the Fall of Nineveh. By the late GEORGE SMITH, Esq., of the British 'Museum.
Página 123 - The Stars in their Seasons. An Easy Guide to a Knowledge of the Star Groups, in 12 Maps.
Página 88 - Look upon the rainbow, and praise him that made it; very beautiful it is in the brightness thereof. It compasseth the heaven about with a glorious circle, and the hands of the Most High have bended it.
Página 123 - EVENINGS AT THE MICROSCOPE ; or, Researches among the Minuter Organs and Forms of Animal Life. By P. H. GOSSE, Esq., FRS A new edition, revised and annotated. Post 8vo Cloth boards 4 o FAN'S SILKEN STRING. By ANNETTE LYSTER, author of " Northwind and Sunshine,
Página 124 - CARE OF HEALTH. By the late EA PARKES, MD, FRS FOOD. By ALBERT J. BERNAYS, Professor of Chemistry at St. Thomas's Hospital. WATER, AIR, AND DISINFECTANTS. By W. NOEL HARTLEY, Esq., King's College. HEALTH AND OCCUPATION. By BW RICHARDSON, Esq., FRS, MD THE HABITATION IN RELATION TO HEALTH.