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