Other questions in this quiz

2. What's the focal length of a lens?

  • The distance from the end of the lens and the focal point
  • The distance between the middle of the lens and its focal point
  • The distance from the origin of the light to the focal point

3. How many lenses does a simple refracting telescope use?

  • 4
  • 1
  • 2
  • 3

4. What type of mirror do most astronomical telescopes use?

  • Convex
  • Concave
  • Curved

5. The more powerful the lens, the shorter the focal length, true or false?

  • True
  • False

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