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A concave mirror would project a real inverted image of the silverpoint onto the panel, which van Eyck would trace.

凹面镜把颠倒的射到木上,于是便可以在子上描画。

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Crash Course Physics 速成课

The object is placed just beyond the focal point of the objective lens, so light rays again form a flipped real image on the other side.

体被放置 在镜焦点之外,因此光线再 在另一侧形成翻转的实像

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Crash Course 综合篇

The original subtended angle is the subtended angle of the unaided eye – the angle between the center of the objective lens and the height of the real image.

原对眼的对——镜中心与实像高度的夹

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