The position of bearing point is got according to the equal angle of rotation between purlin and Queti,thus its maximum internal force can be obtained.
It makes the central maximum in the Airy pattern narrower and increases the depth of focus.Calculation results have shown that this kind of apodizer is superior to the phase-shifting apodizer.
In the real numbers are chosen in such a way that the probability that the number lies in any particular subinterval of this unit interval is equal to the length of the subinterval.