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Telescope
1.
2. • A telescope is a deceive • Maybe you've been out
formed by lenses and looking at the stars in the
curved mirrors for viewing night sky, searching for
enlarged an image of a constellations; or maybe
you've already learned your
distant object, especially way around the
the heavenly bodies .There constellations, and now
are many types to choose you'd like to take a closer
from, and many price look at objects like the
ranges to consider. moon, planets or stars with
the aid of a telescope.
3. • A telescope is an amazing device that has the
ability to make faraway objects appear much
closer. Telescopes come in all shapes and
sizes, from a little plastic tube to the Hubble
Space Telescope, which weighs several tons.
Amateur telescopes fit somewhere in
between, and even though they are not nearly
as powerful as the Hubble, they can do some
incredible things.
4. This telescope uses a large objective lens to
bend, or refract, the light to a point of focus This telescope, one of the Catadioptric
where it is usually family, uses a combination of lens and mirror
reflected by a small, flat mirror into the to capture and focus light.
eyepiece. The eyepiece lens then magnifies The eyepiece then magnifies the image. One
the image. The objective (aperture) of the most popular telescopes in the world,
lens on introductory level refractors tends to owing to their
be relatively small, certainly compared to performance and relative portability.
reflectors with a similar price tag.
Generally regarded as good for observation of
the moon and planets.
5. This telescope uses a large curved primary mirror to
collect the light and then reflect it to a point of focus
where a
secondary mirror deflects it up into the eyepiece.
The eyepiece then magnifies the image. This
telescope, available
in two basic models (Newtonian or Dobsonian) is
generally regarded as a decent all-rounder with a
better deep
space performance than its refracting cousins.
The diameter of this object (lens or mirror), usually
given in mm, is equal to the aperture size. Again,
the larger the aperture, the more light collected, the
better the quality of image.
6. Procedures
Materials
1. The mailing tubes will be the body of the telescope with
the smaller one sliding inside the larger one. The length of
*2 converging lenses (convex lenses) the assembled telescope will be a little longer than the sum
of the focal lengths of the two lenses. Add the value of the
*telescoping tubes (mailing tubes) focal lengths of the short and long lens together. Divide that
length by two and then add another inch. Cut both of the
tubes to that length with a knife or saw.
*manila file folder
2. Use the scissors to cut out two circles from the paper that
are the same size as the diameter of the mailing tube. These
*scissors circle frames will mount and center the lenses on the tube.
Cut out circles that are slightly smaller than the diameter of
the lenses in the center of the paper frame circle. Glue the
*knife or saw lenses to the center of the frame. The shorter focal length
lens will be the eyepiece. Glue that framed lens to the end of
*glue the smaller tube. Glue the other framed lens to the end of
the larger tube.
*1 white poster board 3. Slide the two cardboard tubes together. You have now
assembled a simple refracting telescope. Look through the
eyepiece of your telescope and focus it on a distant object.
*red and black tape Slide the two cardboard tubes in and out until you have a
clear image. What do you observe?
4. Use the red and black tape to make stripes on the white
poster board.
7. In 1609 an Italian physicist and astronomer named Galileo
became the first person to point a telescope skyward. Although
that telescope was small and the images fuzzy, Galileo was able to
make out mountains and craters on the moon, as well as a ribbon
of diffuse light arching across the sky which would later be
identified as our Milky Way galaxy. After Galileo's and, later, Sir
Isaac Newton's time, astronomy flourished as a result of larger
and more complex telescopes. With advancing technology,
astronomers discovered many faint stars and the calculation of
stellar distances. In the 19th century, using a new instrument
called a spectroscope, astronomers gathered information about
the chemical composition and motions of celestial objects.
Twentieth century astronomers developed bigger and bigger
telescopes and, later, specialized instruments that could peer into
the distant reaches of space and time. Eventually, enlarging
telescopes no longer improved our view… all because of the
Earth's atmosphere.
8. • The Gran Telescopio Canarias, also known as
• Large Binocular Telescope (LBT) is an optical GranTeCan or GTC, is a 10.4 m reflecting
telescope for astronomy located on Moun telescope undertaking commissioning
Graham (3,300 m) in the Pinaleno Mountains observations at the Roque de los Muchachos
of southeastern Arizona, and is a part of the Observatory on the island of La Palma, in the
Mount Graham International Observatory. Canary Islands of Spain. The GTC began its
The LBT is currently one of the world's most preliminary observations on 13 July 2007,
advanced optical telescopes; using two 8.4 m using 12 segments of its primary mirror,
wide mirrors can give the same light made of Zerodur glass-ceramic by the
gathering ability as a 11.8 m wide single German company Schott AG. Later the
circular telescope and detail of 22.8 m wide number of segments was increased to a total
one. Either of its mirrors would be the of 36 hexagonal segments fully controlled by
largest optical telescope in continental North an active optics control system, working
America. together as a reflective unit. Its Day One
instrumentation was OSIRIS. Scientific
observations began properly in May 2009.
