Light energy

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Across
  1. 2. with little, or no light at all
  2. 3. changing of light rays
  3. 5. Agent that stimulates sight
  4. 8. allows light to pass, but not detailed shapes
  5. 10. a surface that curves outwards
Down
  1. 1. a surface that curves inwards
  2. 4. throw back the body of light
  3. 6. material that allows light to pass
  4. 7. clear material to concentrate or dispersing light rays
  5. 9. not able to see through