Who is credited with inventing the reflecting telescope?
Explanation: The correct answer is B) Isaac Newton. Isaac Newton is credited with inventing the reflecting telescope in the late 17th century. His design, known as the Newtonian telescope, uses a concave mirror as the primary objective to gather and focus light. This innovation overcame the limitations of chromatic aberration present in refracting telescopes and laid the foundation for modern reflecting telescopes.
Which component of a reflecting telescope is responsible for gathering and focusing incoming light?
Explanation: The correct answer is D) Primary mirror. In a reflecting telescope, the primary mirror is responsible for gathering and focusing incoming light. It is a curved mirror that reflects light back to a secondary mirror, which, in turn, reflects the light to the eyepiece or other imaging devices. The shape and quality of the primary mirror are critical for the performance and image quality of the reflecting telescope.
Which of the following is a characteristic feature of reflecting telescopes?
Explanation: The correct answer is D) They are free from spherical aberration. One of the notable advantages of reflecting telescopes is that they are free from spherical aberration. Spherical aberration is a lens-based optical aberration that causes the light rays passing through the periphery of a lens to focus at a different point compared to those passing through the center, resulting in blurry or distorted images. Reflecting telescopes, with their use of mirrors instead of lenses, do not suffer from this aberration, allowing for sharper and clearer images.
Which of the following is an example of a reflecting telescope?
Explanation: The correct answer is B) Keck Observatory. The Keck Observatory is an example of a reflecting telescope. It consists of two identical telescopes, each with a primary mirror diameter of 10 meters. These telescopes utilize large, segmented mirrors to gather and focus light for astronomical observations. Reflecting telescopes like the Keck Observatory are widely used in ground-based astronomy and provide researchers with valuable data about celestial objects and phenomena.
What is the purpose of the secondary mirror in a reflecting telescope?
Explanation: The correct answer is D) To redirect light to the eyepiece or detector. The secondary mirror in a reflecting telescope plays a crucial role in redirecting the focused light from the primary mirror to the eyepiece or detector. It is usually a smaller, flat mirror positioned at an angle in front of the primary mirror. The secondary mirror reflects the light at a 90-degree angle, allowing it to exit the telescope and reach the observer's eye or the imaging device for further analysis.