GENERAL KNOWLEDGE

Detailed explanation-1: -Telescopes use lenses or mirrors to collect and focus waves from the electromagnetic spectrum, including visible light, allowing us to look at celestial objects. By studying the electromagnetic waves given off by objects such as stars, galaxies, and black holes, astronomers can better understand the universe.

Detailed explanation-2: -The electromagnetic waves we can generally observe on the ground consist of visible light, which is difficult for the atmosphere to absorb, near-infrared rays, and some electromagnetic waves. These wavelength ranges are called atmospheric windows.

Detailed explanation-3: -The visible light spectrum is the segment of the electromagnetic spectrum that the human eye can view. More simply, this range of wavelengths is called visible light. Typically, the human eye can detect wavelengths from 380 to 700 nanometers.