8/27/2023 0 Comments Reflector telescope diagram![]() Focusing mask: A full aperture mask temporarily placed before the primary mirror to aid in focusing the telescope.Meniscus corrector: A meniscus-shaped corrector plate usually used in the Maksutov telescope.Schmidt corrector plate: An aspheric-shaped corrector plate used in the Schmidt telescope.Corrector plate: A full aperture negative lens placed before a primary mirror designed to correct the optical aberrations of the mirror.Primary mirror: The objective of a reflecting telescope.Primary lens: The objective of a refracting telescope.Objective: The first lens or curved mirror that collects and focuses the incoming light.Mirrors and lenses are the critical light-bending components of a telescope. Cheshire collimator: A simple tool to collimate a telescope.So then, it’s the radio receiver on a radio telescope that has an equivalent function to the eyepiece lens of a reflecting telescope. Similarly, for our radio telescope, after the incoming radio waves have been reflected from the parabolic dish in the sub reflector, they’re sent to the radio receiver where an image of these waves will be formed. The eyepiece lens is what finally forms an image of the light incident on the telescope. Which part of a radio telescope has an equivalent function to the eyepiece lens of a reflecting telescope? Let’s now consider one last question about these two types of telescopes. The sub reflector then has an equivalent function to the secondary mirror. In our radio telescope, it’s the sub reflector that receives the radio waves from the parabolic dish and then reflects and focuses them even more toward the radio receiver. We saw that the job of the secondary mirror is to collect the light reflected from the primary mirror and then reflect and focus that light even more tightly towards the eyepiece lens. What part of a radio telescope has an equivalent function to the secondary mirror of a reflecting telescope? Now let’s look at a second question about these two types of telescopes. So then, it’s the parabolic dish that has an equivalent function to the primary mirror. Just like the primary mirror is the first reflector of visible light in a reflecting telescope, so the parabolic dish is the first reflector of radio waves in a radio telescope. And looking up at our radio telescope, we see that incoming radio waves first encounter this parabolic dish. ![]() Our first question asks, what part of a radio telescope has an equivalent function to the primary mirror of a reflecting telescope? Let’s recall that the primary mirror is the first mirror that receives the incoming radiation. But the way they’re constructed is very alike. ![]() They use different kinds of light one uses visible light and the other radio waves. So, we see there are similarities between a radio telescope and a reflecting telescope. So, radio waves come in, bounce off the parabolic dish, then bounce off the sub reflector to the radio receiver, where an image can be formed. And then, they’re reflected and collected on this reflector called a sub reflector, which then focuses these radio waves on the radio receiver. These radio waves are collected on this big parabolic dish. This is a telescope that accepts radio waves from space rather than visible light. Knowing this, let’s now consider how a radio telescope works. So, visible light comes in, is reflected off one mirror, is reflected off a second mirror, and then is sent along to a viewing apparatus, the eyepiece lens. That reflected light is gathered and collected on the secondary mirror and then reflected once more to this eyepiece lens where an image is observed. If we start with a reflecting telescope, this takes in visible light here, and the light is then reflected off of this primary mirror at the back of the telescope. Okay, as we consider this question, let’s look at our diagram which shows, on the bottom, a reflecting telescope and, on the top, a radio telescope. Which part of a radio telescope has an equivalent function to the primary mirror of a reflecting telescope? Radio telescopes use radio waves rather than visible light. The diagram shows a radio telescope and a reflecting telescope.
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