Light from the Land of the SphinxE. Stock, 1896 - 320 頁 |
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第 1 到 5 筆結果,共 79 筆
第 3 頁
... gives , by its intersection with any surface , the shadow which the object will cast on that surface . In the case of a theoretical point source , as here considered , the edge of the shadow would be absolutely defined , all points ...
... gives , by its intersection with any surface , the shadow which the object will cast on that surface . In the case of a theoretical point source , as here considered , the edge of the shadow would be absolutely defined , all points ...
第 4 頁
... give a better shadow than a large one , although the large one gives much more illumination . The sharp shadows , too , given by an arc lamp may be referred to . Now let us consider an illuminating source of finite extent , such as S ...
... give a better shadow than a large one , although the large one gives much more illumination . The sharp shadows , too , given by an arc lamp may be referred to . Now let us consider an illuminating source of finite extent , such as S ...
第 12 頁
... gives the best results for purposes of accuracy . Rumford's is a very con- venient arrangement for forming a rough ... give a higher value of the intensity of the arc lamp , when compared with a gas flame , than another would . To get ...
... gives the best results for purposes of accuracy . Rumford's is a very con- venient arrangement for forming a rough ... give a higher value of the intensity of the arc lamp , when compared with a gas flame , than another would . To get ...
第 18 頁
... give rise to another image in the first mirror , or perhaps in a third mirror ; and so on . Suppose we have two mirrors only . For an object to be able to give an image in either mirror , it must be in front of the mirror , that is , so ...
... give rise to another image in the first mirror , or perhaps in a third mirror ; and so on . Suppose we have two mirrors only . For an object to be able to give an image in either mirror , it must be in front of the mirror , that is , so ...
第 19 頁
... give in M1 an image which we may call I , but which will coincide exactly with 112 , so that they may be called one image , I ; that is to say , an image formed by reflexion first in M , and then in M , would be seen by an eye so ...
... give in M1 an image which we may call I , but which will coincide exactly with 112 , so that they may be called one image , I ; that is to say , an image formed by reflexion first in M , and then in M , would be seen by an eye so ...
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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.