Physical optics semi-circular lens with strong magnetic magnetism for teacher demonstration
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![Physical optics semi-circular lens with strong magnetic magnetism for teacher demonstration
Physical optics semi-circular lens with strong magnetic magnetism for teacher demonstration](http://ae01.alicdn.com/kf/S08fb3ca1a62c42ebb759701f8a9d174bU.jpg)
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Physical optics semi-circular lens with strong magnetic magnetism for teacher demonstration
![Physical optics semi-circular lens with strong magnetic magnetism for teacher demonstration
Physical optics semi-circular lens with strong magnetic magnetism for teacher demonstration](http://ae04.alicdn.com/kf/H6eb231c6066c464db3a8c154b57cc239J.jpg)
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Physical optics semi-circular lens with strong magnetic magnetism for teacher demonstration