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Piggy’s Glasses

Piggy’s Glasses. Fire Starting 101. First we need to see how light works. Here’s how the eye uses light to see… The Eye. Where does light enter the eye? Pupil Lens Optic nerve Sclera. What is the function of the lens? Adjust the amount of light hitting the retina

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Piggy’s Glasses

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  1. Piggy’s Glasses Fire Starting 101

  2. First we need to see how light works. • Here’s how the eye uses light to see… • The Eye

  3. Where does light enter the eye? • Pupil • Lens • Optic nerve • Sclera

  4. What is the function of the lens? • Adjust the amount of light hitting the retina • Focus the light on the retina • Protects the retina • Supports the retina

  5. What is the function of the retina? • Interprets the light signals • Translates light into electrical signals • Supports the optic nerve • Only A and B

  6. Why do you think the glass in the frames of a pair of glasses is called a lens?

  7. What if the Lens can’t do its job? • Causes for Blurry Vision

  8. What happens if the bending of light is caused by something other than our eye?

  9. Farsightedness • When you are farsighted, light focuses: • Too far forward • Too far back • Two different places

  10. If you wanted to catch the fish in the river, how would you compensate? • Reach below where you see the fish. • Get closer to the water. • Move farther away from the water. • Reach above where you see the fish.

  11. Changes in temperature can cause light to bend as well. We commonly call this “mirages”. • Mirages

  12. Sometimes light can refract so much that it cannot leave the material it is in.

  13. Here is how corrective lenses work: • Lens Applet

  14. As the real object is moved farther away from the lens, the image • Moves farther from the lens • Appears bigger • Moves closer to the lens • Appears smaller • Both C and D [Default] [MC Any] [MC All]

  15. How would this apply to the sun? • The sun is bright so the image is also bright. • The image is close to the lens. • The image is small. • Both A and B • Both A, B, and C

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