Other questions in this quiz

2. 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

3. Pressure in a liquid is..

  • difficult to see
  • transmitted equally in all directions
  • hard to measure

4. What is the force that keeps things moving in a circle?

  • Earth
  • Centripetal
  • Velocity

5. What is the principal focus (converging lens)?

  • where the eye focuses
  • where rays hitting the lens parallel to the axis all seem to meet
  • Where the axis crosses the lens

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