Diffractionoptics

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The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged.

"'...I shall keep in as close with the shore as can be, and you shall look at the creatures with my best achromatic glass,'—reaching for a splendid five-lens Dollond, an instrument that Stephen was never allowed to use, because of his tendency to drop telescopes into the sea."--Patrick O'Brian, The Far Side of the World, 277

Optics and refractionpdf

Although with the increase in power it is correspondingly difficult to combine all these corrections in one objective, they are brought to a high pitch of excellence in the present-day "achromatic" objectives, and so remove the necessity for the use of the higher priced and less durable apochromatic lenses.

Clinicaloptics and refraction

While designing the achromatic objective lens for a telescope, he saw the spectrum of sunlight as it passed through a thin slit and the dark emission lines.

A nation's institutional memory is invariably simplistic and achromatic, with good guys in white hats and bad guys in black.

Of course the presence of either of these defects is certainly and correctly indicated by the appearance of one or the other of the colors, under certain circumstances; but the simple visibility of prismatic color is by no means a reliable indication of over or under correction of color, and, indeed, to the honor of our opticians, it may be stated that very few objectives are made that cannot justly be called achromatic in the general sense of the term.

In a refracting telescope we have to employ what is known as the achromatic combination, consisting of one lens of flint glass and one of crown glass, adjusted to suit each other with extreme care.

Opticalrefractiontest

Optics and refractionbook

Ningún eBook disponible.Elsevier IndiaBuscar en una bibliotecaTodos los vendedores »Theory And Practice Of Optics And RefractionPor Khurana  Acerca de este libroPáginas mostradas con permiso de Elsevier India. Derechos de autor.

A nation's institutional memory is invariably simplistic and achromatic, with good guys in white hats and bad guys in black.

This might not necessarily be a real appearance for it is conceivable that such traces of colour might be due to the telescopes employed not having been truly achromatic, that is, not sufficiently corrected for colour; but making every allowance for this possible source of mistake there yet remains proof that the colour which has often been seen has been real.

“Knotted at her throat she wore a lilac scarf that even in the achromatic sunshine cast its color up to her face and down around her moving feet in a lilac shadow.”TENDER IS THE NIGHT