Light and Electricity: Notes of Two Courses of Lectures Before the Royal Institution of Great BritainD. Appleton, 1895 - 194 páginas |
Dentro del libro
Resultados 1-5 de 21
Página 18
... retinal image , and not upon its size . As we retreat from a light , its image upon the retina becomes smaller , and it is easy to prove that the diminution follows the law of inverse squares ; that at a double distance the area of the ...
... retinal image , and not upon its size . As we retreat from a light , its image upon the retina becomes smaller , and it is easy to prove that the diminution follows the law of inverse squares ; that at a double distance the area of the ...
Página 46
... retina , a delicate net - work spread as a screen at the back of the eye . The retina rests upon a black pigment , which reduces to a minimum all internal reflection . 170. By means of the iris the size of the pupil may be caused to ...
... retina , a delicate net - work spread as a screen at the back of the eye . The retina rests upon a black pigment , which reduces to a minimum all internal reflection . 170. By means of the iris the size of the pupil may be caused to ...
Página 47
... retina , and see at the same time the illuminated spot , the pupil would appear bright . But the principle of reversibility , so often spoken of , comes into play here . The light of the illuminated spot in re- turning outward retraces ...
... retina , and see at the same time the illuminated spot , the pupil would appear bright . But the principle of reversibility , so often spoken of , comes into play here . The light of the illuminated spot in re- turning outward retraces ...
Página 48
... retina playing the part of the plate of ground glass in the ordinary camera . For perfectly distinct vision it is necessary that the image upon the retina should be perfectly defined ; in other words , that the rays from every point of ...
... retina playing the part of the plate of ground glass in the ordinary camera . For perfectly distinct vision it is necessary that the image upon the retina should be perfectly defined ; in other words , that the rays from every point of ...
Página 49
... retina . The convergence is augmented by the crystalline lens , which brings the point of intersection forward to the retina itself . 180. A line drawn through the centre of the cornea and the centre of the whole eye to the retina is ...
... retina . The convergence is augmented by the crystalline lens , which brings the point of intersection forward to the retina itself . 180. A line drawn through the centre of the cornea and the centre of the whole eye to the retina is ...
Otras ediciones - Ver todas
Términos y frases comunes
aberration of light analyzer angle of incidence aperture atoms attraction augmented axis bands battery beam of light bodies bright called caused centre circuit coil colors conductor core crystal dark diamagnetic direction discharge distance double refraction duced earth elasticity electric current electrified electro-magnet emission theory employed ether ether waves Faraday film flame force galvanometer glass gypsum heat helix Hence hydrogen Iceland spar illuminated index of refraction induced intensity iron lens lines liquid luminous magnetic marginal rays metals mirror motion needle object oblique optic ordinary oxygen parallel particles passes perpendicular phenomena placed plane of vibration platinum poles portion positive primary principal focus prism produce rays reflected refractive index repelled retardation retina rings rotation round screen secondary shadow slit solar spark spectrum spherical square substance surface thickness tion tourmaline transmitted trebled undulation undulatory theory vapor voltaic current waves white light wire zinc
Pasajes populares
Página 191 - Demy 8vo, 12s. 6d. each volume. VOL. I. — Electric Generators, Electric Light. VOL. II. — Telephone : Various Applications : Electrical Transmission of Energy. Household Readings on Prophecy. By a Layman. Small crown 8vo, 3^.
Página 193 - SOUND : a Series of Simple, Entertaining, and Inexpensive Experiments in the Phenomena of Sound, for the use of Students of every age.