Across
- 2. particles move in the same direction as the wave
- 6. length from the centre of the lens to a point of convergance
- 8. n= 1 รท sin
- 9. line drawn perpendicular to a surface
- 11. produces a beam of light in a single colour
- 13. can happen to a wave that changes speed
- 15. lens that focuses parallel rays
- 16. a lens that is thinner in the middle
- 18. makes use of total internal reflection
- 19. reversed or flipped
- 20. the distance between two wave peaks
- 21. this image cannot be formed on a screen
- 23. made smaller
Down
- 1. occurs when a wave passes through a gap
- 3. when an object is placed inside the F of a converging lens
- 4. when the angle of ______ is greater than the critical angle T.I.R can occur
- 5. inversely proportional to period
- 7. frequency x wavelength
- 10. this is not transported by a wave
- 12. a light wave is an example of this
- 14. made bigger
- 17. an image that hasnt been inverted
- 22. travels in straight lines