What is Astronomical Telescope?
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An astronomical telescope is an optical instrument which is used to see the magnified image of distant heavenly bodies like stars, planets, satellites and galaxies etc.
An astronomical telescope works on the principle that when an object to be magnified is placed at a large distance from the objective lens of telescope, a virtual, inverted and magnified image of the object is formed at the least distance of distinct vision from the eye held close to the eye piece.
An astronomical telescope consists oftwo convex lenses : an objective lens O and an eye piece E. the focal length fo of the objective lens of astronomical telescope is large as compared to the focal length fe of the eye piece. And the aperture of objective lens O is large as compared to that of eye piece, so that it can receive more light from the distant object and form a bright image of the distant object. Both the objective lens and the eye piece are fitted at the free ends of two sliding tubes, at a suitable distance from each other.
The ray diagram to show the working of the astronomical telescope is shown in figure. A parallel beam of light from a heavenly body such as stars, planets or satellites fall on the objective lens of the telescope. The objective lens forms a real,inverted and diminished image A’B’ of the heavenly body. This image (A’B’) now actsas an object for the eye piece E, whose position is adjusted so that the image lies between the focus fe’ and the optical centre C2of the eye piece. Now the eye piece forms a virtual, inverted and highly magnified image of object at infinity. When the final image of an object is formed at infinity, the telescope is said to be in ‘normal adjustment ‘
It should be noted that, the final imageof object (such as stars, planets or satellites) formed by an astronomical telescope is always inverted with respect to the object. But it does not matter whether the image formed by an astronomical telescope is inverted or not, as all the heavenly bodies are usually spherical is shape.
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An Astronomical telescope is an instrument used to explore the elements of the universe like stars, planets, satellites, and galaxies etc.
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Astronomical telescopes are devices which
1 collects more light than your eye.
2 It magnifies objects
3 It resolves close objects.
As lenses have chromatic aberration and spherical aberration the objective of large astronomical telescopes are mirrors..THey collect light and focus into a diagonal mirror where it is magnified by eye pieces..Largest reflector telescope now in use is about 10 meters in diameter.A 30 meter telescope is being made.
An astronomical telescope is an optical instrument which is used to see the magnified image of distant heavenly bodies like stars, planets, satellites and galaxies etc.
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