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