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A potential problem related to the physical installation of the Iris Scanner in regards to the usage of the iris pattern within a biometric system is:
Concern that the laser beam may cause eye damage.
The iris pattern changes as a person grows older.
The optical unit must be positioned so that the sun does not shine into the aperture.
There is a relatively high rate of false accepts.
The correct answer is The optical unit must be positioned so that the sun does not shine into the aperture. Edit: sorry but I'm confused because retinal authentication should be done in house rather than outdoors, should it? The answer is never a concern in real life, or in these days people is starting putting these scanners outdoors? Answer: If you want to install a biometric system, whether iris, retina, etc., to secure ACCESS to a building, would you put it inside or outside of the building?
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