With OpticsCalc, just select the type of calculation and parameters, and enter the known value(s). It does the calculations for you - and you can even copy and paste the results into another document. Some of the calculations it handles are:
- Paraxial Thick Lens
- Snell's Law
- Prism Refraction
- Depth of Focus/Depth of more...
- Corrected a problem where the ray deviaion in the Snells Law pane was compute incorrectly when N1 or N1 computations were performed.