Observing Space Using Telescopes
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Observing Space Using Telescopes

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Questions and Answers

What is the main purpose of using different types of telescopes?

  • To view different types of electromagnetic radiation effectively (correct)
  • To replace the need for human observation in astronomy
  • To increase the brightness of visible light
  • To observe the same region of space multiple times

    • Which type of radiation has a wavelength shorter than visible light?

  • Ultraviolet rays (correct)
  • Microwaves
  • Radio waves
  • Infrared waves

    • What type of telescopes are primarily used to observe visible light from heavenly bodies?

  • X-ray telescopes
  • Infrared telescopes
  • Optical telescopes (correct)
  • Radio telescopes

    • Why is sky watching beneficial for agriculture?

    <p>It provides knowledge about the cycle of seasons</p> Signup and view all the answers

    What significant discovery did Galileo make using his telescope?

    <p>The moons of Jupiter</p> Signup and view all the answers

    Which of the following forms of light can human eyes detect?

    <p>Visible light rays</p> Signup and view all the answers

    Which type of telescope uses mirrors instead of lenses to avoid certain difficulties?

    <p>Reflecting telescopes</p> Signup and view all the answers

    What significant advancement in observation technology has occurred since Galileo's time?

    <p>Development of telescopes that can observe multiple types of radiation</p> Signup and view all the answers

    What problem occurs due to the distortion of light when using lenses in telescopes?

    <p>Chromatic aberration</p> Signup and view all the answers

    What is the primary function of the eyepiece in an optical telescope?

    <p>To magnify the image of the source</p> Signup and view all the answers

    What characteristic of light determines what type of telescope is used for observation?

    <p>The wavelength of the electromagnetic wave</p> Signup and view all the answers

    What was a significant challenge in making very large lenses for telescopes?

    <p>Heaviness and distortion issues</p> Signup and view all the answers

    What has been an impact of advancements in space science and technology on daily life?

    <p>It has provided several comforts and facilities</p> Signup and view all the answers

    What range of wavelengths is classified as visible light?

    <p>400 nm to 800 nm</p> Signup and view all the answers

    What causes light rays to change direction when passing through a lens in a refracting telescope?

    <p>Refraction</p> Signup and view all the answers

    What significant technological advancement did Hans Lippershey contribute to the development of telescopes?

    <p>Invention of the first optical telescope</p> Signup and view all the answers

    Which telescope listed is the largest optical telescope in India?

    <p>3.6m diameter optical telescope</p> Signup and view all the answers

    Which type of telescope utilizes a small plane mirror to deflect light rays?

    <p>Newtonian telescope</p> Signup and view all the answers

    What is the primary function of the eyepiece in a telescope?

    <p>To magnify the image of the source</p> Signup and view all the answers

    Which component of the Cassegrain telescope allows light rays to pass through its center?

    <p>Concave mirror</p> Signup and view all the answers

    What type of radiation do radio telescopes specifically detect?

    <p>Radio waves</p> Signup and view all the answers

    Which of the following statements is true regarding the errors in images produced by mirrors?

    <p>Mirrors produce images without color errors.</p> Signup and view all the answers

    What shape are the dishes of a radio telescope, and what is their function?

    <p>Parabolic, to reflect and converge radio waves.</p> Signup and view all the answers

    What is the primary advantage of using large mirrors in telescopes?

    <p>Large mirrors can collect more light from distant sources.</p> Signup and view all the answers

    What is the main advantage of the Giant Meterwave Radio Telescope over traditional single-dish telescopes?

    <p>It combines data from multiple dishes to simulate a single large dish.</p> Signup and view all the answers

    Which of the following is NOT a study subject for the GMRT?

    <p>Optical spectra of stars</p> Signup and view all the answers

    Why are optical telescopes often placed at high altitudes?

    <p>To avoid interference from atmospheric turbulence and light pollution.</p> Signup and view all the answers

    What is the primary function of the receiver in a radio telescope?

    <p>To construct an image of the source.</p> Signup and view all the answers

    Which type of waves does the GMRT primarily utilize for its observations?

    <p>Radio waves</p> Signup and view all the answers

    What is a disadvantage of Earth-based telescopes mentioned in the content?

    <p>They are always affected by atmospheric conditions.</p> Signup and view all the answers

    What characteristic of the GMRT allows it to be considered a world-standard research facility?

    <p>The low cost of its construction by local scientists.</p> Signup and view all the answers

    What is the maximum effective diameter of the GMRT when all dishes are considered together?

    <p>25 kilometers</p> Signup and view all the answers

    What is the primary function of the Hubble telescope?

    <p>To observe visible light from heavenly objects</p> Signup and view all the answers

    Which organization is responsible for launching the Astrosat satellite?

    <p>ISRO</p> Signup and view all the answers

    What type of telescopes are included in the Astrosat satellite?

    <p>Ultraviolet and X-ray telescopes</p> Signup and view all the answers

    What was the significance of ISRO's achievements in satellite launching?

    <p>It contributed to national and social development</p> Signup and view all the answers

    What year was the Chandra X-ray telescope launched into space?

    <p>1999</p> Signup and view all the answers

    Which of the following statements about the INSAT and GSAT series is true?

    <p>They provide services for telecommunication and meteorological purposes.</p> Signup and view all the answers

    What is the main purpose of using special mirrors in the Chandra telescope?

    <p>To reflect X-rays from celestial sources</p> Signup and view all the answers

    Who is the Chandra telescope named after?

    <p>Subramanian Chandrashekhar</p> Signup and view all the answers

    Study Notes

    Observing Space Using Telescopes

    • Space observation helps us understand our universe, and it's important for research and everyday life comforts.
    • Telescopes are tools for space observation, but different types are needed to observe different forms of light.
    • Light is an electromagnetic wave with wavelengths that we can't always see, but telescopes can detect.
    • Types of radiation: Radio waves, microwaves, infrared waves, visible light, ultraviolet rays, X-rays, and gamma rays.
    • Optical telescopes use lenses or mirrors to collect and magnify visible light from celestial objects.
    • Refracting telescopes use lenses to focus light, but they're difficult to make large because lenses can be heavy and distort.
    • Reflecting telescopes use mirrors to focus light, they're easier to make large and don't have chromatic aberration.
    • Types of reflecting telescopes: Newtonian and Cassegrain.
    • Largest optical telescope in India: Aryabhatt Research Institute of Experimental Sciences, Nainital, with a 3.6 m diameter mirror.
    • Radio telescopes use dishes to capture radio waves from space.
    • Giant Meterwave Radio Telescope (GMRT) in India is a collection of 30 dishes that act as a large single dish, allowing for better radio wave detection
    • Space telescopes are placed above the Earth's atmosphere to avoid atmospheric distortion and light pollution.
    • Hubble telescope is a space-based optical telescope, launched in 1990, it has a 94-inch diameter mirror and orbits 589 km above Earth.
    • Chandra X-ray Observatory is a space-based X-ray telescope, launched in 1999, it uses special mirrors to focus X-rays.
    • Indian Space Research Organization (ISRO) launched the Astrosat satellite in 2015, which has ultraviolet and X-ray telescopes.

    Astrosat

    • Astrosat is a unique satellite with different types of telescopes for observing different forms of light.
    • Many of Astrosat's parts are made in India, highlighting India's progress in space science
    • Data from Astrosat is used by Indian scientists to study the Universe.

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    Related Documents

    Observing Space: Telescopes PDF

    Description

    Explore the different types of telescopes used for space observation and how they help us understand the universe. This quiz covers the properties of light, various radiation types, and the characteristics of refracting and reflecting telescopes. Test your knowledge on how optical telescopes work to magnify celestial objects!

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