25*25*80MM K9 Crystal Triangular Prism for Teaching Light Spectrum Physics Photo Optical Instruments Rainbow Experiment
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![25*25*80MM K9 Crystal Triangular Prism for Teaching Light Spectrum Physics Photo Optical Instruments Rainbow Experiment](http://ae04.alicdn.com/kf/H03fc2cfaeea34518a44b6bec09b1afa8L.jpg)
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