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Across 2. The highest point on a wave 5. A type of wave were the medium moves parallel to the wave direction 7. When a Wave passes through a gap in an opaque object 8. The brains perception of a frequency light 9. An object that allows light to pass through to not obscure vision 13. The return of a wave after contact with another medium 16. The study of light 17. The constructive or destructive interference of a wave from reflection or another wave. 18. Half the distance between the Peak and trough of a wave 19. A type of wave were the medium moves perpendicular to the wave direction

Down 1. When colours are not all focused at a single point 2. A length of time 3. The dark area created when light rays are blocked by an object 4. Radiation given off after absorbing light of short wavelengths 6. The number of oscillations at a point over a time period (usually 1 second) 7. The random dispersal of a substance from a high concentration 10. The change in direction caused by travelling between medians of different densities 11. Energy from electromagnetic radiation to which the type is dependant on frequency 12. Light with wavelengths between 390 and 700nm 14. An object that can modify waves such as sound or light 15. An object that obscures vision by preventing light to pass through