For Your Spare Time...

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