Heat and Light Crossword

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Across
  1. 4. A lens that curves inwards.
  2. 5. A lens that bulges outwards.
  3. 6. A measure of how easily light passes through a material is called .... index.
  4. 8. The part of the eye on which an image forms.
  5. 9. Instrument used to measure temperature.
  6. 12. Rays of light that do not cross when producing this type of image.
  7. 14. What light does when it hits a mirror.
  8. 15. Energy that enables us to see.
Down
  1. 1. Substance that allows heat to flow.
  2. 2. Light is a form of energy called ....... radiation.
  3. 3. Heat transfer through a liquid or a gas.
  4. 7. Bending of light.
  5. 10. Rays of light do cross when forming this type of image.
  6. 11. Heat transfer can occur through a vacuum.
  7. 13. An object that releases or emits light is