The eyepiece lens acts like a magnifying glass looking at the image from the objective lens.
The eyepiece brings the image from the focus to the eyepiece, and magnifies it to your pupil size. This allows you to look at the object.
The main lens or objective lens gathers the light. The eyepiece magnifies the light.
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Front lens - objective Back lens - eyepiece
It has a collection of mirrors and lenses - which direct the incoming image to the eyepiece, which is usually set at 90 degrees to the body of the telescope.
The eyepiece will have a shorter focal length than the objective lens has.
The most important part of a telescope is the telescope tube. Other parts are the viewfinder or optical finderscope, eyepiece, focuser, reflecting mirrors, refracting lenses, and the mount assembly.
Practically all telescopes which use lenses, normally the refracting type. the Reflector use objective Concave Mirrors, but even these need eyepieces or finder scopes.
The "objective" lens (as opposed to the eyepiece).
The focus is between the two lenses, closer to the eyepiece
-- A refracting telescope must have a lens, otherwise it's not a refracting telescope. -- A reflecting telescope can be constructed without any lens, but if you intend to look through it, then you'll use a little lens for the eyepiece.
A refracting telescope is a type of telescope that has a large thin lense at the front and a smaller thicker lense at the end where the eyepiece is. Refracting telescopes use lenses unlike reflecting telescopes that use mirrors to reflect the light. This is a good image of a refracting and reflecting telescope: [See related link]
Front lens - objective Back lens - eyepiece
It has a collection of mirrors and lenses - which direct the incoming image to the eyepiece, which is usually set at 90 degrees to the body of the telescope.
The eyepiece will have a shorter focal length than the objective lens has.
The most important part of a telescope is the telescope tube. Other parts are the viewfinder or optical finderscope, eyepiece, focuser, reflecting mirrors, refracting lenses, and the mount assembly.
Practically all telescopes which use lenses, normally the refracting type. the Reflector use objective Concave Mirrors, but even these need eyepieces or finder scopes.
A reflecting telescope uses mirrors while refracting telescopes uses lens. The refracting telescope also had chromatic aberration and bad resolution while the reflecting telescope had none of these.
Reflecting telescopes don't use lenses - they use mirrors (hence 'reflecting'). Light goes in the top, hits a concave mirror at the bottom of the tube which makes the light converge when it is reflected, then bounces back up to the top where it hits a smaller secondary mirror, where it is directed down the eyepiece. Do you mean refracting telescopes? If so then these do use lenses, the amount depends on the telescope. The most simple form has an objective lens which focuses the light, and then an eyepiece which has a lens in it to magnify the image. The objective lens is convex on the side pointing out of the telescope, and is flat on the other side.
A radio telescope detects light in the form of radio waves and a refracting telescope detects light in the visible wavelengths