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Can be a area of revolution in regards to the lens axis generally known as the equivalent refracting locus from the lens. The point exactly where this locus crosses the axis is called the principal issue, P As the brightness of the image is best on the tip, coma tends https://mini-variable-frequency-d43186.fitnell.com/70330038/5-tips-about-agriculture-monitoring-you-can-use-today

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