Light And Matter

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Across
  1. 3. Something that produces light
  2. 6. Electrical signals at the back of the eye
  3. 7. Not reflective
  4. 8. How things work
  5. 9. Checkerboard
  6. 10. Merging together
  7. 13. Something we observe or measure
Down
  1. 1. Something we can change
  2. 2. A reflective window
  3. 4. Light changes direction
  4. 5. A rule for a class/group
  5. 6. Light bounces off
  6. 11. A project/diagram
  7. 12. Light goes through