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Date: 26-7-2020
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Date: 14-7-2020
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Date: 5-9-2020
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Refractors: Curvature of field
A system which is designed to remove completely astigmatism suffers from curvature of field, as the points of sharp focus lie on a curve rather than on a plane. Flattening of the field can be achieved at the expense of having incomplete removal of astigmatism and usually some compromise is made. The judicial placement of stops in the combination of lenses can also be used to reduce the effect of field curvature.
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دخلت غرفة فنسيت ماذا تريد من داخلها.. خبير يفسر الحالة
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ثورة طبية.. ابتكار أصغر جهاز لتنظيم ضربات القلب في العالم
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قسم شؤون المعارف ووفد من جامعة البصرة يبحثان سبل تعزيز التعاون المشترك
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