Across
- 3. The light-sensitive layer of tissue at the back of the eyeball.
- 6. Red,orange,yellow,green,blue,indigo,violet.
- 8. The distance between a crest and the adjacent crest.
- 9. Allowing all light to pass through.
- 10. The number of waves that pass a fixed point in unit time.
- 11. The bouncing of light rays off an object.
- 12. A substance through which light travels.
- 13. Allowing most but not all light to pass through.
- 14. Has the longest wavelength in the electromagnetic spectrum.
Down
- 1. A unit for measuring frequency.
- 2. Has the shortest wavelength in the electromagnetic spectrum.
- 3. The bending of a lightray.
- 4. Allowing no light to pass through.
- 5. The process or action by which one thing absorbed.
- 7. The range of all types of EM radiation.