Please suggest me any reference values for these two parameter (F number, and throughput).I have gone through the formula to find F-number like f/value in=La/D'; La- entrance arm length , D'-Equivent diameter as seen from entrance slit and f/value out= Lb/D''. in the case of Throughput, formula like (G=(hnkGaBP)/(F 10^6)) .Is this the correctect way to find these two values?

Thank you.

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