1									2
						3	4						5
		6		7														8								9
10																11
12						13																14
												15
				16																		17
		18													19					20
			21							22
					23
																									24
			25				26
													27
		28			29							30
																						31
							32
									33

Across 2. the image that can be seen on the screen 3. image appears to diverge 11. lets some light through 12. buldging out shape 15. produces light when heated 16. red, blue and green light 17. mostly covered in rods and cones 18. light from the sun 19. also known as the pole 22. smallest angle of incidence 23. the angle formed by a incident ray 25. light strikes a medium boundary at an angle larger than the critical angle 27. lets most light through 28. part of our vision which we cannot see things 31. a cell on the retina provides sharp focus and enables us to see colour 32. cyan, magenta and yellow 33. the cone system on the retina is faulty

Down 1. the hole in the middle of the eye that lets light pass through 4. controls the size of the pupil 5. the direct light falls on a surface 6. produces light 7. the transparent curved 'window' covering the eye 8. does not let light through 9. transmits visual images to the brain in eletric signals 10. the point where the convergent rays meet 13. produces light in a chemical reaction 14. ben light when passed through an object 20. the angle formed by a reflected ray 20. the angle formed by a refracted ray 21. the light that bounces off a surface 24. hollowed out shape 26. a carefully curved transparent object 29. finds the angles of incidence and reflection 30. sensitive to low light