A concave mirror would project a real inverted image of the silverpoint onto the panel, which van Eyck would trace.
凹面镜把颠倒的实像投射到木
上，于是范艾克便可
子上描画。
A concave mirror would project a real inverted image of the silverpoint onto the panel, which van Eyck would trace.
凹面镜把颠倒的实像投射到木上，于是范艾克便可子上描画。
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