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when the human eye is expsoed to an external light flux a simplified model of the feedback by using a first order Pade approximation for the time delay term

User Tekiegreg
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When the human eye is exposed to an external light flux, a simplified model of the feedback control mechanismused to regulate the retinal light flux by opening the human iris is shown in the block diagram below, whichillustrates the human pupil servo mechanism

User Kermia
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