An Experimental Treatise on Optics: Comprehending the Leading Principles of the Science, and an Explanation of the More Important and Curious Optical Instruments and Optical Pheonomena; Being the Third Part of a Course of Natural Philosophy, Compiled for Use of the Students of the University at Cambridge, New England, Τόμος 3Hilliard and Metcalf, 1826 - 350 σελίδες |
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Αποτελέσματα 1 - 5 από τα 99.
Σελίδα 10
... seen through the open- ing at O exactly upon the edge CL of the central plate . It is shown by experiment that this is possible ; and the point of inci- dence is always found to fall precisely upon the stroke C ' , there- fore , the ...
... seen through the open- ing at O exactly upon the edge CL of the central plate . It is shown by experiment that this is possible ; and the point of inci- dence is always found to fall precisely upon the stroke C ' , there- fore , the ...
Σελίδα 12
... seen by reflection , will appear at the point D , that is , as far behind the mirror as it really is before it . If the radiant object has a definite extent , each of the radiant points , presented by it , will produce its own ...
... seen by reflection , will appear at the point D , that is , as far behind the mirror as it really is before it . If the radiant object has a definite extent , each of the radiant points , presented by it , will produce its own ...
Σελίδα 13
... seen through the other index , moved to a corresponding point , appears on the mark C ' . Let S and O be the positions of the two indices answering to this condition . Then it is evident that N , the centre of the arc SO ( a point ...
... seen through the other index , moved to a corresponding point , appears on the mark C ' . Let S and O be the positions of the two indices answering to this condition . Then it is evident that N , the centre of the arc SO ( a point ...
Σελίδα 14
... seen , shall coincide with one of the inferior lines seen directly . I shall mention soon how we may arrive at this condition . When we have obtained it , we turn the interior axis a a , until the same coincidence shall be observed ...
... seen , shall coincide with one of the inferior lines seen directly . I shall mention soon how we may arrive at this condition . When we have obtained it , we turn the interior axis a a , until the same coincidence shall be observed ...
Σελίδα 19
... seen with the naked eye , but cannot be received upon a plate of ground glass . When the object is placed at a very great distance from the mirror , the image appears in the principal focus , erect , and much smaller than the object ...
... seen with the naked eye , but cannot be received upon a plate of ground glass . When the object is placed at a very great distance from the mirror , the image appears in the principal focus , erect , and much smaller than the object ...
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Άλλες εκδόσεις - Προβολή όλων
An Experimental Treatise on Optics: Comprehending the Leading Principles of ... Professor John Farrar,Jean-Baptiste Biot Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2016 |
Συχνά εμφανιζόμενοι όροι και φράσεις
according achromatic angle of incidence aperture appear attractive forces axes axis beam become blue bodies calculate centre compose consequently crystal density Descartes determine deviation diameter direction dispersion divergence double refraction effect emergent ray equal experiment extraordinary extraordinary ray extreme eye-glass faces focal distance focus formed glass green heliostat homogeneous Iceland spar incident ray inclined interior lamina lens lenses light limits luminous particles luminous rays magnifying manner medium mirror Newton object object-glass oblique observed ordinary ordinary ray parallel pass perpendicular phenomena phenomenon plane plate of air polarisation portion prism produced ratio of refraction red rays refracted rays refracting power refracting telescope refrangibility render repulsive force retina rhomboid rings second surface sensation sensible simple rings sine spectrum spherical spherometer straight line substance suppose takes place telescope thickness thin tint tion transmission transmitted transparent traverse tube unequal velocity violet rays yellow
Δημοφιλή αποσπάσματα
Σελίδα 334 - The violet light was obtained in the usual manner, by means of a common prism, and was collected into a focus by a lens of a suffiOpt.
Σελίδα 305 - ... varies as the square of the cosine of the angle between the plane of transmission of the analyser and the plane of the polariser.
Σελίδα 334 - ... meridian at right angles. The focus of violet rays was carried slowly along the needle, proceeding from the centre towards one of the extremities, care being taken never to go back in the same direction, and never to touch the other half of the needle. At the end of -half an hour after the needle was exposed to the action of the violet rays, it was carefully examined, and it had acquired neither polarity nor any force of attraction ; but after continuing the operation twenty-five minutes longer,...
Σελίδα 337 - At all other angles also, when the sun's light was reflected from the surface, the color vanished with the inclination, and was equal at equal inclinations on either side. "This experiment affords a very strong confirmation of the theory. It is impossible to deduce any explanation of it from any hypothesis hitherto advanced ; and I believe it would be difficult to invent any other...
Σελίδα 337 - ... lines be placed near each other, they will facilitate the observation. If one of the lines be made to revolve round the other as an axis, the depression below the given plane will be as the sine of the inclination ; and while the eye and the luminous object remain fixed the difference of the length of the paths will vary as this sine. " The best subjects for the experiment are Mr. Coventry's exquisite micrometers; such of them as consist of parallel lines drawn on glass, at a distance of onefive-hundredth...
Σελίδα 225 - Having given the radius of an arc of any colour in the secondary rainbow, find the ratio of the sine of incidence to the sine of refraction when rays of that colour pass out of air into water.