![](https://www.wavegenetic.ru/wp-content/uploads/2019/03/qvarcr.jpg)
Quartz crystal for visualization of invisible fields.
![](https://www.wavegenetic.ru/wp-content/uploads/2019/03/qvarcr.jpg)
![](https://www.wavegenetic.ru/wp-content/uploads/2019/03/qvarc2.jpg)
Crystals of quartz on different optical axes have different properties. With the purpose of seeing the invisible things, it is necessary to cut the plate from a crystal at a certain angle and put it in front of the camera lens (objective)