Question

a small pupil will
o decrease the range of distances at which objects are in focus.
o increase the range of distances at which objects are in focus.
o decrease visual detail.
o make details harder to discern.

Explanation:

A small pupil reduces the amount of light entering the eye and increases depth - of - field, thus increasing the range of distances at which objects are in focus.

Answer:

Increase the range of distances at which objects are in focus.