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6. If images are formed behind the eyeball the person is......

  • Long sighted
  • Short sighted
  • Perfectly normal

7. What type of lens helps someone that is short sighted?

  • Biconvex lens
  • Concave lens
  • Convex lens

8. What shape is a diverging (concave) lens?

  • Curved but the same thickness
  • Thinner in the centre, thicker on the outside
  • Thinker in the centre, thinner on the outside

9. When the image is formed where the light rays appear to come from the image is called.....

  • Magnified
  • Virtual
  • Real

10. On a convex lens if the image is closer to the lens than the principal focus what is the image?

  • Virtual, upright and magnified
  • Virtual, upright and diminished
  • Real, inverted and diminished

11. Convex lens refract the light to ....

  • Converge to a point
  • Diverge away from a point
  • Become parallel

12. What is the cornea?

  • A transparent layer that protects the eye and helps to focus light onto the retina
  • Changes shape to focus light onto the retina
  • the light sensitive cells around the inside of the cells

13. A non-spherical eyeball is called what?

  • Long sight
  • Astigmatism
  • Catarax

14. What is the coloured ring of muscle that controls the amount of light entering the eye?

  • Cornea
  • Iris
  • Pupil

15. What is the distance from the centre of the lens to the principal focus called?

  • The focal length
  • The principal distance
  • The focal distance

16. The ciliary muscles are attached to the eye lens by what?

  • Suspensory ligaments
  • Ciliary ligaments
  • The retina