Other questions in this quiz

2. What is the focal length?

  • the distance from the centre of the lens to the principal focus
  • The distance from each of the principal focuses
  • The distance from the eye to the lens

3. Pressure in a liquid is..

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

4. What type of lens is used for short sighted people?

  • Concave/diverging
  • Convex/converging

5. 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

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