For telescopes, what is one primary characteristic of the reflecting type?

• A. It uses glass lenses
• B. It uses mirrors
• C. It is shorter in length
• D. It produces a brighter image

Answer: (B)

The primary characteristic of a reflecting telescope is that it uses mirrors to gather and focus light. This design allows for the construction of larger apertures compared to refracting telescopes, which rely on glass lenses. Mirrors can be shaped and supported in a way that minimizes distortions and allows for larger sizes without the issues such as chromatic aberration that lenses may suffer from. The use of mirrors is fundamental to the functioning of reflecting telescopes, enabling them to collect more light and produce clearer images of celestial objects. This characteristic distinctly differentiates reflecting telescopes from other types, such as refracting telescopes.