Light & Heat

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Across
  1. 1. A measure of how easily light passes through a material is called its ............ index
  2. 3. What light does when it hits a mirror
  3. 4. Heat transfer in a gas or liquid by the circulation of currents from one region to another
  4. 6. A substance that allows heat to flow through it
  5. 8. A piece of glass or other transparent substance with curved sides for concentrating or dispersing light rays
  6. 9. The emission of energy as electromagnetic waves which can travel through a vacuum
  7. 12. The smallest angle of incidence for which light is totally reflected is the ......... angle
Down
  1. 1. The bending of light as it enters or leaves different mediums
  2. 2. Light is a form of ............. radiation
  3. 5. Rays of light do not cross when producing a ......... image
  4. 6. A lens which bulges outwards is a ....... lens
  5. 7. A lens which curves inwards is a ....... lens
  6. 10. Rays of light do cross when producing a ...... image
  7. 11. Electromagnetic radiation to which the organs of sight react
  8. 13. The part of the eye on which an image forms