30*30*50MM K9 Crystal Triangular Prism for Teaching Light Spectrum Physics Photo Optical Instruments Rainbow Experiment
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![30*30*50MM K9 Crystal Triangular Prism for Teaching Light Spectrum Physics Photo Optical Instruments Rainbow Experiment](http://ae04.alicdn.com/kf/Hdbb0ab31b37b4585b0ce1d670435194e0.jpg)
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