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6. A reflecting telescope uses:

  • A parabolic concave mirror and a convex mirror
  • A spherical concave mirror and a convex mirror
  • A spherical convex mirror and two concave lenses
  • A parabolic concave mirror and a spherical concave mirror
  • Lots of mirrors

7. The resolving power of a telescope is:

  • The smallest angle at which you can distinguish between the sun and the moon
  • The smallest angle at which it can clearly define the edge of the object
  • The biggest angle at which it can distinguish two points
  • The smallest angle at which you can distinguish between two points
  • The biggest angle at which it can clearly define the edge of the object

8. If a mirror in a reflecting telescope isn't quite ______, it will have spherical aberration.

  • Flat
  • Parabolic
  • Round
  • Sharp
  • Spherical

9. What causes chromatic aberration?

  • Tiny bubbles in the lenses
  • The lens being too big
  • The wrong shape of lens
  • Different colours refracting by different amounts
  • The lens being too small

10. Silicon is _______, which makes is useful in CCDs.

  • A semiconductor
  • A metal
  • Artificial
  • An insulator
  • A gas

11. The quantum efficiency of CCDs is higher than that of photographic film.

  • True
  • False

12. Below the pixels are:

  • Extra neutrons
  • Potential wells
  • Spectrum wells
  • Photon wells
  • Electromagnetic waves