Light from the Land of the SphinxE. Stock, 1896 - 320 頁 |
搜尋書籍內容
第 1 到 5 筆結果,共 82 筆
第 1 頁
... seen , there must be light by which to see it . Light is an action taking place in the space between the object seen and the eye which sees it ; and which must also , as a rule , exist independently of the object . For most bodies are ...
... seen , there must be light by which to see it . Light is an action taking place in the space between the object seen and the eye which sees it ; and which must also , as a rule , exist independently of the object . For most bodies are ...
第 2 頁
... seen at a given point takes place in the straight line joining the body to the point . We may show this by means of the following experiment : - Take three screens , with small holes pierced in them . Adjust the three holes in a ...
... seen at a given point takes place in the straight line joining the body to the point . We may show this by means of the following experiment : - Take three screens , with small holes pierced in them . Adjust the three holes in a ...
第 10 頁
... seen , the surface appears equally bright when viewed at any inclination . To compare the intensities of two sources , the plan always adopted is to cause the sources to illuminate two surfaces , so arranged that they can readily be ...
... seen , the surface appears equally bright when viewed at any inclination . To compare the intensities of two sources , the plan always adopted is to cause the sources to illuminate two surfaces , so arranged that they can readily be ...
第 11 頁
... have produced equal illuminations . In Letheby's modification there are two mirrors , M , M ' , on the two sides of the screen S , so that the two sides may be seen at the same time by the two eyes . Rectilinear Propagation of Light . II ...
... have produced equal illuminations . In Letheby's modification there are two mirrors , M , M ' , on the two sides of the screen S , so that the two sides may be seen at the same time by the two eyes . Rectilinear Propagation of Light . II ...
第 12 頁
Harry Forbes Witherby. seen at the same time by the two eyes . and the screen with its mirrors can be a divided scale ... seen : explain why the amount of light received by the eye is independent of the distance of the surface . 4. In ...
Harry Forbes Witherby. seen at the same time by the two eyes . and the screen with its mirrors can be a divided scale ... seen : explain why the amount of light received by the eye is independent of the distance of the surface . 4. In ...
其他版本 - 查看全部
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 various points 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.