British Encyclopedia: Or, Dictionary of Arts and Sciences, Comprising an Accurate and Popular View of the Present Improved State of Human Knowledge, Τόμος 9Mitchell, Ames, and White, 1821 |
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... rays by vapours , which actually enlarge the angle under which the luminaries appear , just as the angle is enlarged by which an object is seen from under water . See PTOLEMY . Alhazen , an Arabian writer , was the next author of ...
... rays by vapours , which actually enlarge the angle under which the luminaries appear , just as the angle is enlarged by which an object is seen from under water . See PTOLEMY . Alhazen , an Arabian writer , was the next author of ...
Σελίδα
... rays of light issuing from the ob- jects , and throws them upon the retina , where the focus of each pencil is . From this principle he discovered the reason why some people are short - sighted , and others long - sighted ; also why the ...
... rays of light issuing from the ob- jects , and throws them upon the retina , where the focus of each pencil is . From this principle he discovered the reason why some people are short - sighted , and others long - sighted ; also why the ...
Σελίδα
... ray AL , and the direction of the same ray CF , after it is refracted ; thus the angle L C F is the angle of deviation . A lens , is glass ground into such a form as to collect or disperse the rays of light which pass through it . These ...
... ray AL , and the direction of the same ray CF , after it is refracted ; thus the angle L C F is the angle of deviation . A lens , is glass ground into such a form as to collect or disperse the rays of light which pass through it . These ...
Σελίδα
... rays , a b ( fig . 1 ) fall upon a plano - convex lens , c d , they will be so refracted , as to unite in a point c , be- hind it ; and this point is called the " principal focus , " or the " focus of pa- rallel rays ; " the distance of ...
... rays , a b ( fig . 1 ) fall upon a plano - convex lens , c d , they will be so refracted , as to unite in a point c , be- hind it ; and this point is called the " principal focus , " or the " focus of pa- rallel rays ; " the distance of ...
Σελίδα
... ray . The rays diverge from any radiant point , as from a principal focus ; therefore , if a candle be placed at f , in the focus of the convex glass FG , the diverging rays in the space Ff G will be so refracted by the glass , that ...
... ray . The rays diverge from any radiant point , as from a principal focus ; therefore , if a candle be placed at f , in the focus of the convex glass FG , the diverging rays in the space Ff G will be so refracted by the glass , that ...
Άλλες εκδόσεις - Προβολή όλων
The British Encyclopedia: Or, Dictionary of Arts and Sciences ..., Τόμος 9 William Nicholson Προβολή αποσπασμάτων - 1818 |
The British Encyclopedia: Or, Dictionary of Arts and Sciences. Comprising an ... William Nicholson Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2015 |
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