Heat and Light

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Across
  1. 4. the part of the eye on which an image forms
  2. 6. a measure of how easily light passes through a material is called its ......... index
  3. 7. substance that allows heat to flow
  4. 10. ht is a form of energy called...... radiation
  5. 13. heat transfer can occur through a vacuum
  6. 14. at greater angles of incidence than this, light is totally internally reflected
  7. 15. energy that enables us to see
Down
  1. 1. an object that releases or emits light
  2. 2. what light does when it hits a mirror
  3. 3. instrument used to measure temperature
  4. 5. lens that curves inwards
  5. 8. lens that bulges outwards
  6. 9. a transparent piece of plastic or glass that is shaped to curve outwards or inwards
  7. 11. heat transfer through a liquid or gas
  8. 12. bending light