Reflector telescopes, like most telescopes, are primarily designed to detect visible light, a type of electromagnetic energy.

However, some reflector telescopes can be modified to detect other forms of electromagnetic radiation, like:

* Infrared radiation: Some reflector telescopes are equipped with detectors sensitive to infrared light, which is emitted by objects that are too cool to emit visible light.

* Radio waves: Radio telescopes are essentially large reflector telescopes, which collect radio waves from distant objects.

* Ultraviolet radiation: Special coatings and detectors are needed to detect ultraviolet radiation.

While reflector telescopes are versatile and can be adapted for different types of electromagnetic radiation, they are primarily designed for visible light observation.