特製伸縮型木製暗箱
外箱尺寸：100×100×150mm
內箱尺寸：85×85×160mm
內附凸透鏡片及多孔照門片。
Used to demonstrate the principles of optics. Consists of a telescoping wooden box about 150mm(L) x 100mm(W) x 100mm(H). A small pinhole in the end of the outer box allows an image to form on the ground glass plate of the inner box.
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