Light from the Land of the SphinxE. Stock, 1896 - 320 頁 |
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第 1 到 5 筆結果,共 32 筆
第 11 頁
... substance which will show the illumination behind . A blackened screen or diaphragm is placed normally to this , dividing it into two portions . The two lights are then adjusted close to the blackened diaphragm , so as to illuminate the ...
... substance which will show the illumination behind . A blackened screen or diaphragm is placed normally to this , dividing it into two portions . The two lights are then adjusted close to the blackened diaphragm , so as to illuminate the ...
第 42 頁
... substance , set with the plane face A C horizontal , and the curved sides at right angles to the vertical circle . DEFK is a block of the same substance , with the face EF FIG . 35 . set at right angles to the tube GH , and having a ...
... substance , set with the plane face A C horizontal , and the curved sides at right angles to the vertical circle . DEFK is a block of the same substance , with the face EF FIG . 35 . set at right angles to the tube GH , and having a ...
第 98 頁
... substance . Sunlight is allowed to enter a darkened room through a small hole , O , in a shutter , and to fall on a white screen . S FIG . 82 . The light may be direct from the sun , or reflected by a mirror . An image of the sun would ...
... substance . Sunlight is allowed to enter a darkened room through a small hole , O , in a shutter , and to fall on a white screen . S FIG . 82 . The light may be direct from the sun , or reflected by a mirror . An image of the sun would ...
第 99 頁
... substances , there being few substances in nature whose colours are simple . A substance will , then , be illuminated by light of its own colour only ; or of such colours as its colour contains , if its colour is composite . And we ...
... substances , there being few substances in nature whose colours are simple . A substance will , then , be illuminated by light of its own colour only ; or of such colours as its colour contains , if its colour is composite . And we ...
第 101 頁
... substance of very small refracting angle , i . Then- - D , = ( μ , − 1 ) i , Do D = = ( μ - 1 ) i , ( μ — 1 ) i . Then the limiting ratio of dispersion to deviation is D. - D , D " and this is equal to My - My μ I This fraction is ...
... substance of very small refracting angle , i . Then- - D , = ( μ , − 1 ) i , Do D = = ( μ - 1 ) i , ( μ — 1 ) i . Then the limiting ratio of dispersion to deviation is D. - D , D " and this is equal to My - My μ I This fraction is ...
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常見字詞
aberration achromatic analyzer angles of incidence aperture apparatus astigmatic axis bright band called centre circle concave lens consider convex lens corresponding cos² crystal denote direction displacement distance disturbance edge ellipse emergent equal eye-piece film focal length focal lines given glass illumination image formed incident light index of refraction lenses light falls magnifying medium minimum deviation Nicol normal object and image object-glass optical ordinary parallel particle pass path pencil pencil of light perpendicular phase phase-difference placed plane of polarization plane polarized light plate polarized beam principal focus principal plane prism produced quantity radius ratio reflected rays reflexion refractive index refrangibility retina rhomb right angles rotated screen seen side sin² slit small object solid angle spectrum spherical spherical aberration straight line substance Suppose surface telescope thickness velocity vibrations violet virtual wave wave-front wave-length wave-surface white light
熱門章節
第 42 頁 - ... that the ratio of the sines of the angles of incidence and refraction is constant for refraction in the same medium, was effected by Snell and Descartes.
第 75 頁 - ... traversing the lens are reflected from a concave mirror and again refracted by the lens, forming a real inverted image coincident with the object : if the distance between the lens and the mirror is a shew that the radius of the mirror is a + J /. 21. A small air-bubble in a sphere of glass 4 inches in diameter appears when looked at so that the bubble and the centre of the sphere are in a line with the eye, to be 1 inch from the surface. What is its true distance ? (jt=l-5.) 23.
第 160 頁 - ... they should have been previously cut in the house, from the pattern given by one of the cards that had been mounted and cut in the instrument. In mounting the instrument in place, the points to attend to are, (1) that it shall be level as regards east and west, (2) that the axis of the ring shall be inclined to the horizon at an angle equal to the latitude of the place...
第 75 頁 - Taking the refractive index from air to glass as \, draw an accurate picture of the path of a ray of monochromatic light, which falls at an incidence of 60° on the face of a prism, whose vertical angle is 30°.
第 311 頁 - ... film was still wet, and the black has floated toward the surface. Paint behavior is not ordinarily erratic; under similar painting conditions, similar results may be expected; and the painter who has learned the characteristics of each of his pigments is able to control their effects. Additive Colors. When white light passes through a prism it is broken up into its component parts and the rays emerge in the familiar rainbow or spectrum arrangement, the rays at the red end having the longest wave...
第 43 頁 - The figure shows the passage of the ray for this case, i and r are the angles of incidence and refraction at the first surface, at the point A.