Corrections

1. Corrections

2. Eye worksheet • 1. Choroid • 2. Light-sensitive nerve cells, rods and cones or photoreceptors • 3. Iris – pupil reflex • 4. Sclera • 5. A hole – allows light to enter the eye • 6. On the retina • 7. The lens • 8. Aqueous humour • 9. Iris • 10. Vitreous humour

3. 11. Optic nerve • 12. When looking at colours or for details • 13. The spot where the optic nerve leaves the retina – no rods or cones here • 14. Pupil will contract (get smaller), muscles of the iris make the hole smaller • 15. long and thin • 16. Upside down • 17. The light bends as it passes through the cornea and the lens • 18. Light hits the object, and the reflected light enters our eye. The image then forms on our retina and the information is sent to out brain. • 19. White light contains all colours. The shirt absorbs some colours but not red, so it is reflected back. • 20. Refraction – bending of light rays when light enters another substance and moves at a different speed

4. 21. You can see at 15 feet what you should see at 20 feet (not good) • 22. You can see at 25 feet what you should see at 20 feet (good) • 23. a) Eye is too long b) light rays are bent too much • 24. a) eye is too short b) light rays are not bent enough • 25. Lens no longer accommodates (gets fat to see close objects) • 26. Malformation present at birth (not covered, did you look it up?) • 27. It will bend the light rays apart so the image forms on the retina and not before • 28. Combination of problems