I guess the main confusion of defining this lens is probably the setting of depth/frequency. % |V:F. f
Rk<:m+V =
The main fresnel lens types are: <Bwu N,}
Up:#Zs2
* Constant groove depth. NNX/ 2
* Contant groove pitch types. qyto`n7
IftPN6(Z
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. _" n4SXhq
SWt"QqBU
Hope this helps!!
