P7 Physics - Observing the universe = P7B Using telescopes

This is for twenty first science, please rate and comment, i would like to know if its actually helped or not, good luck on your exam :)

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  • Created by: Charlotte
  • Created on: 03-06-11 18:55

1. Which one out of the two definitions below is the definition of convex lens? The other definition is for Concave lens.

  • A lens that is thicker in the centre than the edges causing light rays to converge
  • A lens that is thicker at the edges than in the centre causing light rays to diverge
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2. What word is this definition for: The spreading out of a wave as it passes through a small aperture

  • focal length
  • reflection
  • refraction
  • diffraction
  • dioptres

3. From the list below, which one of these does not affect telescopes on earth?

  • the atmosphere
  • asmospheric refraction
  • light pollution
  • temperature
  • bad weather

4. Fill in the missing word: Rays from the top of the object go to the bottom of the image. So the image is _____

  • Inverted
  • Reflected
  • Refracted
  • Diffracted

5. What is the main disadvantage of a reflecting telescope? The others arent true about a reflecting telescope.

  • Its hard to make sure it has no imperfections
  • the eyepiece has to be inside the telescope so obscuring some of the image.
  • it refracts blue light more than red
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Comments

John Redmond

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Question 10 is wrong, should be 15

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