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The number refers to the diameter of the objective (almostġ7 feet across!). Two famous reflector telescopes are shown below. The secondary mirror and its supports can produceīright objects have spikes (the ``christmas star effect''). Often a secondary mirror is used to redirect the light into a more.A reflector telescope's tube is open to the outside and the optics need.It is easy to get the optics out of alignment.Only one side of the reflector telescope's objective needs to be perfect.Īlas! Despite the advantages of the reflector telescope, astronomers must Because light is reflecting off the objective, rather than passing.Reflector telescopes are cheaper to make than refractors of the same.Support for the objective mirror is all along the back side so they.Reflector telescopes do not suffer from chromatic aberration becauseĪll wavelengths will reflect off the mirror in the same way.Its advantages over the refractor telescope.
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Research telescopes and large amateur ones are of the reflector type The parabolic-shaped mirror focusses the parallel The light rays are parallel to each other, the reflector telescope'sĪ parabolic shape. (including those in our solar system) are so far away thatĪll of the light rays coming from them reach the Earth as parallel rays. The reflector telescope uses a mirror to gather and focus light. Select the photographs to display the original source in Video lecture for this chapter This material (including images) is copyrighted!. Index in separate window - Please support this website Telescopes Reflector Telescopes Chapter index in this window