Fortify
发表于 2025-3-28 16:37:48
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allergen
发表于 2025-3-28 20:16:28
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Infirm
发表于 2025-3-29 00:06:33
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根除
发表于 2025-3-29 03:34:05
Extension of the aperture notion,int viewed through a centred optical lens system will itself be a perfect point. We lay down a set of conditions such as Gauss’s approximation, whereby light beams have little slope relative to the axis and are very close to it, so that we can then ignore effects such as aberration.