| 31. | This is obtained by a wide angled achromatic condenser above the polarizer, and a high power microscopic objective.
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| 32. | Achromatic lenses are corrected to bring two wavelengths ( typically red and blue ) into focus in the same plane.
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| 33. | The first person who succeeded in making a practical achromatic refracting telescope was Chester Moore Hall from Essex, England.
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| 34. | They developed achromatic holographic optics that compensate for any change in the emission wavelength of the laser diode with temperature.
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| 35. | The glass blanks were ground and polished into a 12-inch achromatic lens by Brashear & Co in 1920.
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| 36. | Malcolm used an original design incorporating achromatic lenses like those used in telescopes, and improved the windage and elevation adjustments.
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| 37. | Subsequently the new glasses would demonstrate their value in correcting astigmatism, and in the production of achromatic and apochromatic lenses.
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| 38. | The most common type of achromat is the "'achromatic crown glass such as BK7, which has lower dispersion.
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| 39. | With such small sample sizes and low response rates, it is difficult to accurately diagnose the'typical achromatic conditions '.
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| 40. | One more potential evolutionary issue is that the eye does not contain anything like an achromatic doublet that would prevent chromatic aberration.
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