Other questions in this quiz

2. How can you tell something is a real image?

  • the light can produce an image on the screen
  • it can be seen with a magnifying glass
  • it can be seen on a TV

3. What is refractive index?

  • The ratio of speed to light in a vacuum to in the medium
  • the incident ray parallel to the principal focus
  • The refracted ray parallel to the principal focus

4. What is the principal focus (diverging lens)?

  • Where rays hitting the lens parallel to the axis appear to come from
  • where rays hitting the lens parallel to the axis all seem to meet
  • Where the axis crosses the lens

5. 2 materials X-rays are absorbed by

  • bone and metal
  • tissue and blood
  • plastic and metal

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