Some aspects of X-ray physics will be explained here.
The symbols used in this website are defined as follows.
| Symbol |
Description |
Unit |
| D | diameter | m |
 |
decrement of the refractive index | 1 |
| f | focal length of a lens | m |
| L | length of a refractive X-ray lens | m |
| N | number of single focusing elements in a refractive X-ray lens | 1 |
| R | radius of curvature of the refracting surface of an X-ray lens | m |