Gr 8 Natural Sciences Ch 4.3: Telescopes
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Questions and Answers

What is a disadvantage of refracting telescopes?

  • They are harder to maintain than reflecting telescopes
  • They are more expensive to produce than reflecting telescopes
  • They are only used in space
  • They suffer from chromatic aberration (correct)

    • What type of telescope uses a curved primary mirror to collect and reflect light?

  • Refracting telescope
  • Reflecting telescope (correct)
  • Radio telescope
  • Space telescope

    • What is the advantage of using a large mirror in a reflecting telescope?

  • It is lighter and more portable
  • It is more durable and resistant to damage
  • It is easier and cheaper to produce than a large lens (correct)
  • It is more difficult to maintain and clean

    • Where is the Southern African Large Telescope (SALT) located?

    <p>In the Karoo near Sutherland</p> Signup and view all the answers

    What type of telescope detects radio waves from distant objects?

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

    What is an advantage of using a radio telescope?

    <p>It can be used in all weather conditions and during both day and night</p> Signup and view all the answers

    What is the main advantage of placing a telescope in space?

    <p>It can observe the whole sky and provide sharper images</p> Signup and view all the answers

    What is an example of a space telescope?

    <p>The Hubble Space Telescope</p> Signup and view all the answers

    What is the primary function of a telescope?

    <p>To gather and magnify light from distant objects</p> Signup and view all the answers

    What is the term for the main mirror in a reflecting telescope?

    <p>Primary Mirror</p> Signup and view all the answers

    What type of distortion occurs when a lens fails to focus all colors to the same convergence point?

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

    Which type of telescope collects visible light?

    <p>Optical Telescope</p> Signup and view all the answers

    What is the purpose of an eyepiece lens in a refracting telescope?

    <p>To magnify the image formed by the objective lens</p> Signup and view all the answers

    What type of telescope is placed in space to collect various types of electromagnetic radiation?

    <p>Space Telescope</p> Signup and view all the answers

    What is the term for relating to the sky or outer space?

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

    What type of telescope uses a convex lens to collect and focus light?

    <p>Refracting Telescope</p> Signup and view all the answers

    What is the primary advantage of using a large mirror in a reflecting telescope over a large lens in a refracting telescope?

    <p>Large mirrors are easier and cheaper to produce than large lenses.</p> Signup and view all the answers

    What makes the location of the Southern African Large Telescope (SALT) ideal for observations?

    <p>Low light pollution, high elevation, and dry conditions.</p> Signup and view all the answers

    What is the main difference between the information provided by optical telescopes and radio telescopes?

    <p>Optical telescopes provide information on visible light, while radio telescopes provide information on radio waves.</p> Signup and view all the answers

    What is the purpose of the MeerKAT array in the Northern Cape?

    <p>To form part of the larger Square Kilometre Array (SKA) when completed.</p> Signup and view all the answers

    What is the benefit of using a space telescope like the Hubble Space Telescope?

    <p>It can observe the whole sky and provide sharper images due to the absence of atmospheric distortion.</p> Signup and view all the answers

    What is a common activity for students to explore the night sky?

    <p>Using Stellarium or other tools to identify constellations and celestial objects.</p> Signup and view all the answers

    What is the result of chromatic aberration in a refracting telescope?

    <p>Different colors focus at different points, leading to blurry images.</p> Signup and view all the answers

    What is the primary purpose of the primary mirror in a reflecting telescope?

    <p>To collect and focus light from distant objects.</p> Signup and view all the answers

    What is the main reason why astronomers cannot visit distant stars or galaxies directly?

    <p>Due to their vast distances from us</p> Signup and view all the answers

    What happens to light from stars as it travels through space?

    <p>It travels in a straight line</p> Signup and view all the answers

    What is the purpose of a telescope in astronomy?

    <p>To gather and magnify the light from distant objects</p> Signup and view all the answers

    What is the advantage of using a space telescope?

    <p>It can collect various types of electromagnetic radiation blocked by Earth's atmosphere</p> Signup and view all the answers

    Which of the following is an example of an optical telescope?

    <p>Refracting Telescope</p> Signup and view all the answers

    What is the function of the objective lens in a refracting telescope?

    <p>To collect and focus light</p> Signup and view all the answers

    What is the term for the failure of a lens to focus all colors to the same convergence point?

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

    How many main types of telescopes are there?

    <p>3</p> Signup and view all the answers

    What is the main reason why chromatic aberration is not a problem in reflecting telescopes?

    <p>Because they use a curved primary mirror</p> Signup and view all the answers

    What makes the location of the Southern African Large Telescope (SALT) ideal for observations?

    <p>Its high elevation and low light pollution</p> Signup and view all the answers

    What is the main difference between the information provided by optical telescopes and radio telescopes?

    <p>The wavelength of light detected</p> Signup and view all the answers

    What is the primary function of a telescope in astronomy?

    <p>To collect and magnify light from distant objects</p> Signup and view all the answers

    What is a common feature of refracting and reflecting telescopes?

    <p>Use of mirrors or lenses to collect and focus light</p> Signup and view all the answers

    What is the main advantage of using a space telescope like the Hubble Space Telescope?

    <p>It can observe the whole sky</p> Signup and view all the answers

    What is the primary function of the primary mirror in a reflecting telescope?

    <p>To collect and focus light</p> Signup and view all the answers

    Why is it essential to study celestial objects using telescopes?

    <p>Because they are too far away to visit directly</p> Signup and view all the answers

    What is the benefit of using a large mirror in a reflecting telescope?

    <p>It can collect more light</p> Signup and view all the answers

    What is the main difference between refracting and reflecting telescopes?

    <p>The type of lens or mirror used to collect and focus light</p> Signup and view all the answers

    What is the purpose of the MeerKAT array in the Northern Cape?

    <p>To provide radio images of distant objects</p> Signup and view all the answers

    What is the result of collecting more light from distant objects using a telescope?

    <p>An increase in the image's clarity</p> Signup and view all the answers

    What is the benefit of using space telescopes like the Hubble Space Telescope?

    <p>They can avoid interference from Earth's atmosphere</p> Signup and view all the answers

    What can be observed by using Stellarium or other tools?

    <p>Constellations and celestial objects visible from a specific location</p> Signup and view all the answers

    What is the purpose of the objective lens in a refracting telescope?

    <p>To collect and focus light from distant objects</p> Signup and view all the answers

    What type of aberration occurs when a lens fails to focus all colors to the same convergence point?

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

    What is the primary reason why reflecting telescopes are more suitable for observing distant objects?

    <p>They do not suffer from chromatic aberration, allowing for sharper images.</p> Signup and view all the answers

    What is the primary advantage of using a space telescope like the Hubble Space Telescope?

    <p>It can observe the entire sky without interruption from Earth's atmosphere.</p> Signup and view all the answers

    What is the primary function of the primary mirror in a reflecting telescope?

    <p>To collect and focus light from distant objects.</p> Signup and view all the answers

    What is the primary difference between the information provided by optical telescopes and radio telescopes?

    <p>Optical telescopes provide information about the visible spectrum, while radio telescopes provide information about the radio spectrum.</p> Signup and view all the answers

    What is the primary advantage of using a large mirror in a reflecting telescope?

    <p>It allows for the collection of more light from distant objects, resulting in sharper images.</p> Signup and view all the answers

    What is the primary reason why the location of the Southern African Large Telescope (SALT) is ideal for observations?

    <p>It is located in an area with low light pollution, high elevation, and dry conditions.</p> Signup and view all the answers

    What is the primary benefit of using Stellarium or other tools to observe the night sky?

    <p>It provides a simulated view of the night sky, allowing for identification of constellations and celestial objects.</p> Signup and view all the answers

    What is the primary purpose of building a simple refracting telescope?

    <p>To explore how lenses work to collect and focus light.</p> Signup and view all the answers

    What is the primary reason why astronomers rely on telescopes to study distant celestial objects?

    <p>Because they are too distant and their light can be captured by telescopes</p> Signup and view all the answers

    What is the main advantage of using a convex lens in a refracting telescope?

    <p>It enables the formation of a clearer image by focusing light to a point</p> Signup and view all the answers

    What is the main reason why chromatic aberration is a problem in refracting telescopes?

    <p>Because the lens fails to focus all colors to the same convergence point</p> Signup and view all the answers

    What is the primary purpose of a reflecting telescope's primary mirror?

    <p>To collect and focus light from distant objects</p> Signup and view all the answers

    What is the main advantage of using space telescopes like the Hubble Space Telescope?

    <p>They can collect various types of electromagnetic radiation blocked by Earth's atmosphere</p> Signup and view all the answers

    What is the main reason why the Andromeda galaxy is visible to the naked eye?

    <p>Because it is relatively close to us</p> Signup and view all the answers

    What is the primary function of an eyepiece lens in a refracting telescope?

    <p>To magnify the image formed by the objective lens</p> Signup and view all the answers

    Why do astronomers use different types of telescopes to study celestial objects?

    <p>Because different types of telescopes are specialized for specific types of objects</p> Signup and view all the answers

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