Discussion
Consider the following statements about the resolution equation.
1. Resolution improves as the square root of plate number
2. Selectivity gives the largest return of the three levers
3. Raising the capacity factor above ten improves resolution greatly
Which of the statements given above is or are correct?
Answer: A
The first two are correct and the third overstates: the capacity term approaches one asymptotically, so beyond about ten there is almost nothing left to gain while the run grows longer. Knowing that one lever saturates, another returns only a square root, and the third can transform a separation is what makes method development a matter of judgement rather than of trying everything in turn. Checking the units of each quantity catches a wrong formula before the arithmetic begins. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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