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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Página 25
... 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 ; this happens , also in looking - glasses : you do not see yourself on the surface ...
... 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 ; this happens , also in looking - glasses : you do not see yourself on the surface ...
Página 28
... nearer to the perpendicular a b than the line a s , which was its first direction . But when a ray passes from a denser medium into a rarer , it moves in a direction farther from the per- pendicular ; thus if the ray r a pass through ...
... nearer to the perpendicular a b than the line a s , which was its first direction . But when a ray passes from a denser medium into a rarer , it moves in a direction farther from the per- pendicular ; thus if the ray r a pass through ...
Página 33
... nearer to the side . at b . Tutor . I did not move the basin , and therefore could have had no power in altering the course of the light . Charles . It is very clear that the ray was refracted by the water at s : and I see that the ...
... nearer to the side . at b . Tutor . I did not move the basin , and therefore could have had no power in altering the course of the light . Charles . It is very clear that the ray was refracted by the water at s : and I see that the ...
Página 34
... nearer to a perpendicular , which may be conceived to be the side of the vessel . Tutor . The same thing may be shown with a candle in a room other wise dark : let it stand in such a man- ner as that the shadow of the side of a pan or ...
... nearer to a perpendicular , which may be conceived to be the side of the vessel . Tutor . The same thing may be shown with a candle in a room other wise dark : let it stand in such a man- ner as that the shadow of the side of a pan or ...
Página 37
... nearer the surface than it actually is , and a marksman shooting at it must aim below the place which it seems to occupy . Charles . Does the image of the object seen in the water always ap- pear higher than the object really is ? Tutor ...
... nearer the surface than it actually is , and a marksman shooting at it must aim below the place which it seems to occupy . Charles . Does the image of the object seen in the water always ap- pear higher than the object really is ? Tutor ...
Termos e frases comuns
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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Página 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.
Página 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...
Página 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.
Página 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.
Página 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.
Página 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...
Página 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.
Página 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.
Página 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...