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Updated: April 30, 2025
His mind is one of the many dense and refractive mediums through which the Government of India looks out upon India. From time to time he is called upon to write a minute or a note on some given subject, and then it is that his thoughts and words expand freely.
M.D. Berthelot has pointed out and experimented with a very interesting process, founded on the measurement by the phenomena of interference of the refractive index of a column of air subjected to the temperature it is desired to measure.
The glass was highly refractive and so perfectly translucent, I at first thought there was none there, and when I stood upon its edge, and looked down into a fiery gulf below, I instinctively thought of the "Lost People," who are said to wander amid torturing yet unconsumable flames. But, happily, the ones I gazed upon were harmless ones.
In many parts of the world that night a pallid halo encircled it about. It was perceptibly larger; in the clear refractive sky of the tropics it seemed as if it were nearly a quarter the size of the moon. The frost was still on the ground in England, but the world was as brightly lit as if it were midsummer moonlight.
These three transparent refractive media, by which the rays of light that enter the eye are broken up and re-focussed, are enclosed in a solid round capsule, composed of several different coats, something like the concentric layers of an onion. The outermost and thickest of these envelopes is the white sclerotic coat of the eye. It consists of tough white connective tissue.
The refractive power of these yellow stones is remarkable, and the goniometer will probably reveal a higher index than is accorded to all the varieties of beryl by the learned Abbé Haüy.
In fact, the control of that explosive copper bullet is the only thing they had that I wasn't able to get and I'll get that on this trip." "What is that arenak armor they're wearing?" "Arenak is a synthetic metal, almost perfectly transparent. It has practically the same refractive index as air, therefore it is, to all intents and purposes, invisible.
The most valuable mineral is sulphur, the supply of which appears to be inexhaustible. The chief exports are wool, oil, fish, horses, eider-down, knit goods, sulphur, and Iceland moss. Transparent calcite, a mineral commonly called "Iceland spar," is found, one mine of which furnishes an excellent quality. It is highly prized by mineralogists on account of its double refractive qualities.
The powdered glass and water have much the same refractive index; that is, the light undergoes very little refraction or reflection in passing from one to the other. "You make the glass invisible by putting it into a liquid of nearly the same refractive index; a transparent thing becomes invisible if it is put in any medium of almost the same refractive index.
Annealed glass has its molecules symmetrically arranged round every line that can be drawn through it; hence it is not doubly refractive. But let the substance be either squeezed or strained in one direction, the molecular symmetry, and with it the symmetry of the ether, is immediately destroyed and the glass becomes doubly refractive. Unequal heating produces the same effect.
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