The index of refraction of ebonite was found by Profs.
"Scientific American Supplement, No. 288" by Various
It must evidently diminish as the refractive index increases.
"Six Lectures on Light" by John Tyndall
If balsam of copaiba is made use of, the index of refraction of which is 1.50, a symmetrical field of about 24 deg.
"Scientific American Supplement, No. 441, June 14, 1884." by Various
C., 1.045-1.06; optically inactive; refractive index at 20 deg.
"The Handbook of Soap Manufacture" by W. H. Simmons
This is to be done by using a film of oil of the same refractive index as the glass.
"On Laboratory Arts" by Richard Threlfall
The refractive index of gypsum is 1.54, but heat none, being opaque.
"The Chemistry, Properties and Tests of Precious Stones" by John Mastin
But when a transparent solid is immersed in a liquid of the same refractive index as itself, it immediately disappears.
"Fragments of science, V. 1-2" by John Tyndall
The mineral has a high refractive index, and strong bi-refringence.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4" by Various
This corresponds to an index of refraction of 1.69.
"Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2" by Various
The eye sees what is presented but the inversions and other peculiar effects are due to variations in the refractive index of the atmosphere.
"Visual Illusions" by Matthew Luckiesh
The diamond has the highest refractive index of any gem-stone (2.42).
"Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5" by Various
Compute the speed of light in water, the index of refraction being 1.33.
"Physics" by Willis Eugene Tower
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The same behavior happens for the square of the refraction index n2 , for the phase velocity Vph (t), and for the group velocity Vgr (t), as it is shown in panels (b), (c), and (d) of Fig. 2, respectively.
Light propagation with non-minimal couplings in a two-component cosmic dark fluid with an Archimedean-type force and unlighted cosmological epochs
For the parameters that guide the properties of light propagation we see from Fig. 2 that ˙H (t) asymptotically vanishes, see panel (a), and the refraction index, the phase velocity and the group velocity tend quasiperiodically asymptotically to one, see panel (b), (c), and (d), respectively.
Light propagation with non-minimal couplings in a two-component cosmic dark fluid with an Archimedean-type force and unlighted cosmological epochs
Panel (b): The plot of the square of the refraction index n2 (τ ) is presented in the panel (b) for the parameter Q = 0.7.
Light propagation with non-minimal couplings in a two-component cosmic dark fluid with an Archimedean-type force and unlighted cosmological epochs
It contains at least three eras, in which the refraction index exceeds one, three eras with n < 1, and n2 (τ ) tends asymptotically to one at t → ∞.
Light propagation with non-minimal couplings in a two-component cosmic dark fluid with an Archimedean-type force and unlighted cosmological epochs
At the end of this unlighted epoch the refraction index takes zero value, and starting from this point electromagnetic waves can propagate and transfer information into the universe.
Light propagation with non-minimal couplings in a two-component cosmic dark fluid with an Archimedean-type force and unlighted cosmological epochs
From the plots Fig. 3 we see that ˙H (t) also oscillates, which in turn reﬂects again in the behavior of the refraction index n2 (t), the phase velocity Vph (t), and the group velocity Vgr (t).
Light propagation with non-minimal couplings in a two-component cosmic dark fluid with an Archimedean-type force and unlighted cosmological epochs
Thus this unlighted epoch is separated by two points, where the refraction index vanishes and the effective phase velocity takes inﬁnite values.
Light propagation with non-minimal couplings in a two-component cosmic dark fluid with an Archimedean-type force and unlighted cosmological epochs
In between them the square of the refraction index is positive.
Light propagation with non-minimal couplings in a two-component cosmic dark fluid with an Archimedean-type force and unlighted cosmological epochs
Since unlighted epochs with a negative effective refraction index squared can start and ﬁnish only when n2 (t(∗) )=0 or n2 (t(∗∗) )=∞, the group velocity is zero at the unlighted epochs boundary points.
Light propagation with non-minimal couplings in a two-component cosmic dark fluid with an Archimedean-type force and unlighted cosmological epochs
Indeed, ˙H , guides the behavior of the effective refraction index, with the interest in this choice is that only one function, n2 → 1, when ˙H → 0.
Light propagation with non-minimal couplings in a two-component cosmic dark fluid with an Archimedean-type force and unlighted cosmological epochs
If the non-minimal parameter q1 is negative, then during the acceleration epoch (i.e., −q(t) > 0) the square of the refraction index is positive, and there are no unlighted epochs.
Light propagation with non-minimal couplings in a two-component cosmic dark fluid with an Archimedean-type force and unlighted cosmological epochs
Now the square of the refraction index is positive during the acceleration epoch (−q(t) > 0) when the non-minimal parameter q1 is positive.
Light propagation with non-minimal couplings in a two-component cosmic dark fluid with an Archimedean-type force and unlighted cosmological epochs
The phase mismatch vector is q = kSF − ka − kb with ki = ni2π/λi representing wave vector and ni is refractive index of the corresponding wave.
Parametric wave interaction in quadratic crystal with randomized distribution of ferroelectric domains
For circularly-polarized light, the angular momentum of each photon is ħ/(npng ), where np is the phase refractive index.
Generalized Lorentz law and the force of radiation on magnetic dielectrics
Also, the sensor NV’s ﬂuorescence is eﬃciently coupled into the target bulk diamond when it is centered on a mesa, due to the diamonds high refractive index.
Nanoscale magnetic imaging of a single electron spin under ambient conditions
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