light and sight crossword

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Across
  1. 1. The bouncing back of light when it hits a surface.
  2. 2. rays invisible electromagnetic waves that have more energy than visible light and can cause sunburn. These rays are used to sterilize (clean) medical equipment.
  3. 3. A form of energy that makes things visible and allows us to see.
  4. 4. A transparent object that bends and separates light into its different colors.
  5. 9. rays invisible waves of electromagnetic radiation that are felt as heat but cannot be seen by our eyes. These are used in TV remotes, alarm systems and night vision cameras.
  6. 11. A type of light that is produced by heating a material until it glows, like a traditional light bulb.
  7. 14. An object that produces its own light, like a star or a light bulb.
  8. 15. radiation energy that travels in waves through space, carrying light, heat, and other forms of energy. It includes visible light, radio waves, X-rays, and more.
  9. 17. A tiny particle of light that carries energy and makes up light waves.
Down
  1. 1. The bending of light as it passes from one material into another, like from air into water.
  2. 5. A straight line that represents the path of light.
  3. 6. The origin of light, such as the sun, a light bulb, or a candle.
  4. 7. A dark area created when an object blocks light.
  5. 8. A material that allows some light to pass through but not enough to see clearly, like frosted glass.
  6. 10. A material that allows light to pass through it without obstruction, like clear glass.
  7. 12. The ability to see, which involves light entering the eyes.
  8. 13. The range of colours that light can be separated into, usually seen in a rainbow.
  9. 16. A material that does not let light pass through, such as wood or metal.