What is the function of a telescope?

A telescope's primary function is to focus and concentrate radiation from distant objects, specifically light in the case of optical telescopes. This allows us to view astronomical bodies such as stars, planets, and galaxies that are far away from Earth. By gathering and concentrating light, telescopes enhance our ability to observe details that would otherwise be too faint to see with the naked eye. This capability opens a window to understanding the universe, enabling astronomers to study the characteristics, composition, and movements of celestial objects.

The other options relate to different scientific instruments or functions. For example, measuring temperature variations typically involves thermometers or thermal sensors. Amplifying sound pertains to devices like microphones or amplifiers, and calculating atmospheric pressure is done using barometers. Each of these tools serves a distinct purpose not associated with the function of a telescope.