Unit C crossword By:Cassidy white

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Across
  1. 2. Red, green, and blue light; adding these three colours of light produces white light
  2. 5. Angle of incidence of a wave hitting a surface equals the angle of reflection
  3. 6. Colours of visible light; the colours in a rainbow or viewed when light is split by a prism
  4. 10. Bending of light as it travels from one material to another material
  5. 12. Refers to the whole range of wavelengths of visible and invisible electromagnetic radiation
  6. 13. The number of pixels per unit area in a digital image
  7. 15. Describes animals that are active at night
  8. 16. Special lining on the back of the eye; when light hits the retina, receptor cells send messages to the brain, which translates them into an image
  9. 18. Device that converts light into electrical energy; used in digital cameras
  10. 19. Point at which light rays meet, after being reflected by a mirror, or refracted by a lens
  11. 20. Short for picture element ; individual element of a digital image
  12. 22. The ability of certain organisms to produce light by a chemical reaction
  13. 23. Diagram used to represent how light travels; each ray has an arrow to show the direction of travel
  14. 24. Eyes that are made up of many smaller units; found in insects and crustaceans
Down
  1. 1. Hole or opening in a camera that lets light in
  2. 3. Telescope that uses a curved mirror and a lens to form an enlarged image
  3. 4. Band of muscle in the eye that controls the size of the pupil and the amount of light entering the eye
  4. 7. All forms of radiant energy: invisible light, infrared radiation, ultraviolet radiation, radio waves, X-rays,etc...
  5. 8. Form of artificial light; uses electrical energy to heat a thin wire thread that glows white hot
  6. 9. Light-sensitive cells found in the retina of the eye; there are two types: rods and cones
  7. 11. Nerve that leads from the retina to the brain
  8. 14. Model used to explain the characteristics and behavior of light energy
  9. 17. Acronym for radio detection and ranging; system that detects reflected microwaves
  10. 20. Opening in the eye that lets in light
  11. 21. Process of creating an image using a computer