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′ describe a vertical ellipse with important axis three times the insignificant axis. The pictures formed by every one of the lesser zones of the lens match into this ellipse and fill it out with a uniform intensity of light. If the image plane is moved alongside the axis by https://opticians-near-me58887.spintheblog.com/30242789/how-portable-speaker-can-save-you-time-stress-and-money

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