Across
- 2. This colour absorbs all light
- 4. Speed in the direction of prorogation
- 6. Measure of distance form one crest to another
- 10. Condition of farsightedness
- 12. Mirror curved inward
- 13. Moving vibration from one point to another
- 15. An electromagnetic wave
- 18. The part that controls the pupil
- 19. The throwing back of light from an object without absorption
Down
- 1. Condition of shortsightedness
- 3. muscles The part that moves the eye and places image on the fovea
- 5. Mirror curved outwards
- 7. The bottom point of a wave
- 8. Flat mirror
- 9. This colour reflects all light
- 11. The bending of light
- 14. Distance between middle of a wave and the crest / trough
- 16. Amount of waves passed in a point for a certain amount of time
- 17. light The only part of the EM spectrum humans can see