Scientific Dialogues: Intended for the Instruction and Entertainment of Young People, Inwich the First Principles of Natural and Experimental Philosophy are Fully Explained. Vol. II, IV-VI.J. Johnson, 1809 |
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Стр. 24
... stopped , and if they were not stopped , they could not be reflected . No glass , however , is so transparent , but it reflects some rays : 1 put your hand to within three or four inches of OPTICS . III Refraction of Light.
... stopped , and if they were not stopped , they could not be reflected . No glass , however , is so transparent , but it reflects some rays : 1 put your hand to within three or four inches of OPTICS . III Refraction of Light.
Стр. 25
... inches of the window , and you see clearly the image of it . James . So I do , and the nearer the hand is to the glass , the more evident is the image , but it is formed on the other side of the glass , and beyond it too . Tutor . It is ...
... inches of the window , and you see clearly the image of it . James . So I do , and the nearer the hand is to the glass , the more evident is the image , but it is formed on the other side of the glass , and beyond it too . Tutor . It is ...
Стр. 26
... inches thick ; and a ray of light sa , to fall upon it at a , it will not pass through in the direction s s but when it comes to a , it will be bent towards the perpendicular a b , and go through the glass in the course a r , and when ...
... inches thick ; and a ray of light sa , to fall upon it at a , it will not pass through in the direction s s but when it comes to a , it will be bent towards the perpendicular a b , and go through the glass in the course a r , and when ...
Стр. 32
... inch or two from the place where it was fastened at the bottom , and from which , you may convince yourself , it has not moved . James . I should like to be con- vinced of this : will you make the ex- periment again , that I may be ...
... inch or two from the place where it was fastened at the bottom , and from which , you may convince yourself , it has not moved . James . I should like to be con- vinced of this : will you make the ex- periment again , that I may be ...
Стр. 52
... inches , and the other three inches , I say , as 4+ 3 : 4 :: 6 : 24 = 3 % , or to nearly three inches and a half . I saw a gentleman lighting his pipe yesterday by means of the sun's rays and a glass , was that a double con- vex 52 OPTICS .
... inches , and the other three inches , I say , as 4+ 3 : 4 :: 6 : 24 = 3 % , or to nearly three inches and a half . I saw a gentleman lighting his pipe yesterday by means of the sun's rays and a glass , was that a double con- vex 52 OPTICS .
Часто встречающиеся слова и выражения
A B C A B Plate angle of incidence angle of reflection appear attract body called Charles colours compass concave lens concave mirror CONVERSATION convex lens convex mirror dark diameter direction distinct vision diverge double convex equal eye-glass farther feet figure flected focal distance focus of parallel formed half humours inches incident rays inverted image iron James ject lenses Let A B light flowing look looking-glass magnifying power means microscope move nearer needle nosegay object object-glass optic optic nerve painted parallel rays pass pencil of rays perpendicular piece plain mirror Plate 11 proceed radius rainbow rays fall rays flowing rays of light reflected rays reflecting telescope refraction retina seen shutter side small hole south pole spectator stance stand steel Suppose surface throw tion transparent tube Tutor violet vitreous humour
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Стр. 80 - Seasons return, but not to me returns Day, or the sweet approach of ev'n or morn, Or sight of vernal bloom, or summer's rose, Or flocks or herds or human face divine ; But cloud instead, and ever-during dark Surrounds me, from the cheerful ways of men Cut off, and for the book of knowledge fair Presented with an universal blank Of nature's works, to me expung'd and ras'd, And wisdom at one entrance quite shut out.
Стр. 85 - First the flaming red Sprung vivid forth ; the tawny orange next ; And next delicious yellow ; by whose side Fell the kind beams of all-refreshing green. Then the pure blue, that swells autumnal skies, Ethereal...
Стр. 8 - How distant some of these nocturnal suns ! So distant (says the sage) 'twere not absurd To doubt, if beams, set out at nature's birth, Are yet arriv'd at this so foreign world ; Though nothing half so rapid as their flight.
Стр. 109 - ... as the angle of reflection is always equal to the angle of incidence, the image for any point can be seen only in the reflected ray prolonged.
Стр. 166 - Meantime, refracted from yon eastern cloud, Bestriding earth, the grand ethereal bow Shoots up immense; and every hue unfolds, In fair proportion, running from the red To where the violet fades into the sky.
Стр. 172 - Died in the fainting Violet away. These, when the clouds distil the rosy shower, Shine out distinct adown the watery bow ; While o'er our heads the dewy vision bends Delightful, melting on the fields beneath. Myriads of mingling dyes from these result, And myriads still remain ; infinite source Of beauty, ever blushing, ever new. Did ever poet image aught so fair, Dreaming in whispering groves, by the hoarse brook; Or prophet, to whose rapture heaven descends...
Стр. 187 - Yes; the three glasses next the eye baving their focal distances equal, the magnifying power is found by dividing the focal distance of the object-glass by the focal distance of one of. the eye-glasses.
Стр. 49 - A lens is glass ground into such a form, as to collect or disperse the rays of light which pass through it. These are of different shapes, and from thence receive different names.
Стр. 61 - If anoto glass, FG, of the same convexity as DE, be placed in the rays at the same distance from the focus, it will refract them so, as that, after going out of it, they will be all parallel...