a refracting telescope
a refracting telescope
The telescope you are referring to is likely a refracting telescope. In a refracting telescope, light enters through an objective lens which bends the light rays to a focal point where the image is formed. This type of telescope is commonly used in astronomy and for terrestrial viewing.
something toward which effort is directed
Goal objective is the purpose toward which an endeavor is directed. Something that one's efforts or actions are intended to attain or accomplish; purpose; target.
Detached and objective
Refracting telescopes From Saiyanisland.com
Reflecting telescopes do this. There are many different kinds of reflectors.
A refracting telescope works just like a magnifying glass. It uses a convex glass lens (to bend light and bring it into focus. This lens is thicker in the center than it is toward its edges, which bends the light more at the edge of the lens than light coming through the center. This allows all of the light to come together at a focus point. The point of focus is where the image is created. If someone looks into the eyepiece, a concave lens magnifies the image Refracting telescopes have two main problems-images are not always clear because the light is being bent and the size of the lens is limited (which limits the power of the telescope).
A parabolic shape is used for all reflecting collectors ... visible light telescope, radio telescope, satellite receiver, etc. A parabolic reflector directs all parallel incoming rays toward one point, called the 'focus' of the parabola.
Frederick Douglass did not bring an end to racism in America, although he did make a contribution toward that objective.
This ensure responsibility toward each groups contributors made in like with objective
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