A hunting rifle with a telescopic sight (called a 'scope') can also be used as a basic telescope to view distant objects (called 'glassing') but note this practice this is considered by hunters to be exceptionally poor field craft for a few reasons.
1) To use the telescopic sight mounted on a rifle as a basic telescope, the rifle must be pointed at the distant object. If the distant object turns out to be a small group of people, then you will be pointing a rifle at those people - DO NOT EVER point a rifle at a person for the obvious safety reason. Only a total n00b asking for trouble 'glasses' for game in the field. In some areas, pointing a rifle at another hunter in the field is considered a hostile act and they may react in a hostile manner.
2) The telescopic rife sight must first be sighted in by firing the rifle and carefully adjusting the scope for a specific range. That is, the field of view is maximized for that specific sighting range. Other ranges either nearer or farther will give a poor field of view for use as a general telescope. Field adjustments to the scope to try to improve the field of view may throw off the sights.
3) A good set of binoculars will give a much better field of view with a much wider zoom adjustment range. With binoculars, a better zoom and larger field of view allows seeing more detail both nearer and farther.
Competent hunters carry binoculars for scouting or searching for game and only use a rifle's telescopic sight for aiming their rifle, once game is found.