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板上，于是范艾克便可以在板子上
画。
写集,素
,写簿,写生簿;
;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板上，于是范艾克便可以在板子上画。
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