I guess the main confusion of defining this lens is probably the setting of depth/frequency. jpYZ)
So-
um/F:rp
The main fresnel lens types are: Y <Ae_yLa
- 8"K|ev
* Constant groove depth. be-HF;lZe'
* Contant groove pitch types. "u sPzp5
ib> ~3s;
So if your depth is fixed you will define +ve value in the cell and to specify the "height" or "depth" of each groove feature. If the frequency of the groove is fixed then you use -ve value. Say putting down - 5 this implies that there are 5 grooves with a unit length. dlZ2iDQ%
(O!CH N!:
Hope this helps!!
