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The five Seidel sums can be calculated by tracing a paraxial ray from object to picture throughout the lens and by tracing also a paraxial principal ray through the centre in the aperture quit outward in the two directions towards the thing and picture, respectively. The angle of incidence i https://cheapprescriptionglasses22109.wizzardsblog.com/29879742/top-latest-five-opticians-urban-news

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