50-100
The sagittal depth of a sphere of radius R and semidiameter y can be calculated with: x = R minus sqr root of ( R-squared – y-square). The focal shift caused by adding a thin lens of a given diopter value can likewise be calculated with simple formulas, and we find that 3 diopters would shift the focus by 1.75mm. ................
................
To fulfill the demand for quickly locating and searching documents.
It is intelligent file search solution for home and business.