Other questions in this quiz

2. Which type of scanning ionising?

  • X-rays
  • Ultrasound
  • Microwaves

3. What is the focal length?

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

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

  • Convex/converging
  • Concave/Diverging

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

  • Where the axis crosses the 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

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