1. Gemstones are transparent minerals and can therefore be examined using optical methods . 2. Here, particularly optical methods are utilized for brain research and brain control. 3. The information is read optically and written by combining magnetic and optical methods . 4. Two optical methods are used : indirect and direct optical triggering. 5. Analysis is usually performed using culture, biochemical and sometimes optical methods . 6. These optical methods are classified as either spatial or flux based. 7. As with all optical methods , reflective or transparent surfaces raise difficulties. 8. The optical methods include shadowgraphy, extinction tomography, and Mie Imaging. 9. The enantiomeric excess of a substance can also be determined using certain optical methods . 10. The deformations around the hole are measured during the experiment using strain gauges or optical methods .
