On the Phenomena of Newton's Rings when formed between two transparent Substances of different refractive Powers.
On Newton's Rings between two substances of different refractive powers,' both Papers satisfactory to myself.
The position of the principal focus depends not only on the shape of the lens, but also on the refractive power of the material composing the lens.
Flint glass contains lead; the lead makes the glass dense, and gives it great refractive power, enabling it to bend and separate light in all directions.
Cut glass and toilet articles are made of flint glass because of the brilliant effects caused by its great refractive power, and imitation gems are commonly nothing more than polished flint glass.
The greater the refractive power of the lens, the greater the bending, and the nearer the principal focus to the lens.
But all the composite apparatus for the movement of the eye and its accommodation to variations of light and distance are still absent, namely, the various refractive media, the highly differentiated membrane of the optic nerve, etc.
If the Aether does possess different degrees of density which decide the refractive index of the substance, then of a certainty there must be some law to govern and decide the density, and that law can only be the Law of Gravitation.
The pair of cephalic eyes are highly-developed vesicles with a refractive lens (fig.
The diamond has the highestrefractive index of any gem-stone (2.
It is sometimes met with colourless, and such are its refractive powers and brilliancy that it has been mistaken for diamond.
The position and angles of their faces, and cleavages, the absence of bi-refringence, and their high refractive index all showed that the crystals were true diamond.
The refractive index, which is thus a very important character in the scientific discrimination of gem-stones, may be conveniently determined, within certain limits, by means of the refractometer devised by Dr G.
This instrument is an improved form of the total reflectometer, in which the refractive power of a given substance is determined by the method of total reflection.
The exceptional beauty of the fiery flashes in the diamond is due to its high dispersion, in other words, to the difference between the refractive indices for the red rays and the violet rays at the extremities of the spectrum.
The peculiar lustre exhibited by the diamond is called adamantine, and is shared to some extent by certain other stones which have a high refractive index and high dispersion, such as zircon.
Thus in topaz, which is optically positive, the refractive indices for sodium light are [alpha] = 1.
It is perfectly transparent, yet it hasrefractive qualities.
A curious refractive effect developed about the straining hulks as space near them bent under their lashing power.
The blue and red of flame and hot wire had changed, in the whiplash of a second, to a refractive but transparent cloud that hung there within the apparatus.
There was no hint of color, just a refractive blur that told him the wire was there.
This organism is described as being 5-6 mu long and 1 mu thick, slightly motile, and possessing bright refractive spots at the poles of the bacilli.
The bright refractive spots above referred to are, however, granules taking the usual stains quite readily, and not spores as supposed by Kern.
THE mirage is an optical phenomenon, produced by the refractive power of the atmosphere.
A highlyrefractive vitreous composition, variously colored, used in making imitations of precious stones or gems.
Defn: A device for determining the refractive state of the eye by observing the movements of the retinal lights and shadows.
The history of chemistry presents a striking example in point--Newton foresaw from the high refractive index of the diamond that it would contain a combustible substance since so many combustible oils have a high refractive power.
This constant is called the refractive energy, and its product with the atomic or molecular weight of a substance the refraction equivalent.
The refractive power of substances also entirely depends on the composition and the properties of the component elements.
This may be due in part to the varying refractive indices of the oils used, as well as to the difference in the quantity of oil required in each test.
Although the ratio of the sines is constant, the refractive index varies in different media.
In this way we get a compound lens, which, if the two lenses had the same refractive power, would simply amount to a plano-concave lens with the marginal portions removed.
The doubly convex lens is composed of crown glass, and the concave lens of flint glass, which has a higher refractive and dispersive power than crown glass.
The combustibility of the diamond was predicted by Sir Isaac Newton on account of its high refractive power; it was first established experimentally by the Florentine Academicians in 1694.
In the above argument the whole space between the object and the lens is supposed to be occupied by matter of one refractive index, and [lambda] represents the wave-length in this medium of the kind of light employed.
Unlike other cubic crystals, diamond experiences a diminution of refractiveindex with increase of temperature.
The former, possessing least power of dispersing the colored rays relative to its mean refractive power, must be of greater value than the latter.
Mr. Keir is of opinion that some new composition must be discovered, which, along with a sufficient refractive power, shall possess a greater uniformity of texture.
Now the refractive index of Iceland spar is, for the extraordinary ray less, and for the ordinary greater, than for Canada balsam.
It must evidently diminish as the refractive index increases.
The sine of this angle is the reciprocal of the refractive index of the medium.
Those Superficies of transparent Bodies reflect the greatest quantity of Light, which have the greatest refracting Power; that is, which intercede Mediums that differ most in their refractive Densities.
But the refractive Powers of these unctuous Substances are two or three Times greater in respect of their Densities than the refractive Powers of the former Substances in respect of theirs.
Water has a refractive Power in a middle degree between those two sorts of Substances, and probably is of a middle nature.
Whence it seems rational to attribute the refractive Power of all Bodies chiefly, if not wholly, to the sulphureous Parts with which they abound.
Where I suppose, that the Sines which measure them are in round Numbers, as 3 to 4, though probably the Dissolution of Soap in the Water, may a little alter its refractive Virtue.
Salts and Vitriols have refractive Powers in a middle degree between those of earthy Substances and Water, and accordingly are composed of those two sorts of Substances.
Their refractive power and consistency vary somewhat, and probably their chemical constitution still more.
The refractive power of the skeleton in the various legions is very different, depending upon the chemical constitution.
Extracapsular body without pigment, contains between its alveoles in the inner half numerous, dark refractive oil-globules, in the outer half numerous amoeboid lumps of protoplasm, irregularly scattered.
For not only are the general appearance of the small clear spheres, their refractive power, and regular distribution in the endoplasm quite similar, but they are also of much the same size, for the diameter ranges from 0.
Sometimes they are strongly refractive and shining, and sometimes feebly refractive and pale; their consistency shows all intermediate stages between a thin fluid, which readily disappears in water, and a firm, insoluble jelly.
The pores are separated by small vertical, highly refractive rods (opercular rhabdillae); these become intensely stained by carmine, and are either evenly distributed over the surface of the porochora or arranged in definite groups.
It is only by comparing different cases of refracted light at changing angles of incidence that the common factor, the constancy of the refractive index, is disclosed.
Air, finally, has so small an index of refraction and so small a deflective influence upon light, that the refractive effect is commonly imperceptible altogether.
A plano-convex has only half of the refractive power of the double convex; the parallel rays, falling on the convex side of the lens, would converge at the distance of the whole diameter of the sphere.
The refractive power of some substances is immense, while that of others is very trifling.
The refractive power of the material of comets has been carefully tested.
The refractive power of the air bends the luminous rays round and shows the sun, though it is directly screened by the intervening obstacles.
Careful measurements of the great comet in 1881 showed, however, that in the neighbourhood of the nucleus there was some refractive power, though quite insignificant in comparison with the refraction of our atmosphere.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "refractive" in a variety of sentences. We hope that you will now be able to make sentences using this word.
