| 11. | For complements of trees, the achromatic number can be computed in polynomial time.
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| 12. | Had he done so, he would almost certainly have invented the achromatic lens.
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| 13. | Colors nearest the center or the poles are most " achromatic ".
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| 14. | He suggested using two achromatic lenses of " six inches focus " placed apart.
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| 15. | White in pigment or dye form has no color ( it is called achromatic ).
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| 16. | This was especially true in refracting telescopes, before the invention of achromatic objective lenses.
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| 17. | Its bill is also achromatic, but tan near the bottom of the lower jaw.
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| 18. | :: There is a rare form of colourblindness where the vision becomes completely achromatic.
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| 19. | The 1955 model came with a meniscus lens, later replaced with an achromatic lens.
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| 20. | For example, microlensing is achromatic.
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