Light and sight

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Across
  1. 4. something that doest’t give out light on its own.
  2. 7. Something that changes the direction of light by making it pass through transparent material.
  3. 8. degrees A sidewards triangle
  4. 9. something that glows.
Down
  1. 1. Something that doesn’t let light through.
  2. 2. something that is see through.
  3. 3. mirror something that cave inwards.
  4. 5. We use it to see
  5. 6. mirror something that bends out wards.
  6. 7. Something that bounces off of something else