Discussion
Inter-pupillary distance (IPD) for a lower resolution face image is considered to be less than :
Answer: B
The key gives 30.
The inter-pupillary distance (IPD) is the distance in pixels between the centres of the two pupils of a face image, and it is used as a measure of how much detail the face has. The lower the IPD, the lower the resolution, and below a certain value automatic recognition and human comparison both break down; a study I found reports human accuracy falling to chance at 5 to 10 pixels.
I could not find a standard that fixes the threshold for a "lower resolution" image, with a unit or otherwise, so the value 30 rests on the University's key and not on a source I could check. The other options (40, 50 and 60) describe larger inter-pupillary distances, which means better, not lower, resolution.
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