For Your Spare Time...

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Across
  1. 3. Travels at 3.00x10^8 m/s (3 Words)
  2. 4. Centre of the sphere where the surface has been used to construct a mirror (3 Words)
  3. 6. Defined as the "bending of light when it passes from one medium to another"
  4. 9. Represented by "A" in the acronym "SALT"
  5. 10. Type of image formed when light arrives or is reproduced by the image
  6. 11. Type of lens that is thinnest in the middle results in parallel rays travelling in different paths after refraction
  7. 12. The line that is drawn through the centre of curvature to the midpoint of the mirror (2 Words)
  8. 13. An example of the emission of light through a firefly
  9. 18. Type of image formed when light does not arrive or come from the image location
  10. 19. Known as a condition of far sightedness
Down
  1. 1. Defined as the "reproduction of an object through the use of light"
  2. 2. Classificated depending on the colours of the rainbow (ROYGBIV) (2 Words)
  3. 5. Light Defined as the "bouncing back" of light from a surface
  4. 7. Defined as the perpendicular point stricken by the second medium and incident ray
  5. 8. Defined as a polished surface that reflects an image
  6. 10. A ray which reflects outward from the reflective surface (2 Words)
  7. 14. A ray of light that strikes a surface (2 Words)
  8. 15. A line which represents the direction which light travels on a diagram (2 Words)
  9. 16. Type of lens that is thickest in the middle and results in parallel rays meeting at a point after refraction
  10. 17. Point at which the principal axis meets the mirror