This work has been released into the public domain by its author, ajizai. This applies worldwide. In some countries this may not be legally possible; if so: ajizai grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
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Captions
Refraction of light ray through a glass slab
プラスチックのブロックを通過する光束
Refracción de un rayo de luz a través de una placa de vidrio