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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.....
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?
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