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JELL-O OPTICS. How Does Light Bend?. Refraction Light travels slower through dense materials: Water Plastic / Glass & JELL-O! Light bends when it enters a substance at an angle. This is known as REFRACTION!. REFRACTION. What do lenses do?. Diverging Lenses (Concave shaped).

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Presentation Transcript
how does light bend
How Does Light Bend?
  • Refraction
      • Light travels slower through dense materials:
          • Water
          • Plastic / Glass &
          • JELL-O!
      • Light bends when it enters a substance at an angle.
      • This is known as REFRACTION!
what do lenses do
What do lenses do?

Diverging Lenses (Concave shaped)

what do lenses do5
What do lenses do?

Converging Lenses (Convex shaped)

how does your eye work
How Does Your Eye Work?
  • Objects form an upside-down image on the retina.

Lens

Focal point

Retina

object

image

Focal point

EYE

how does your eye work7
How Does Your Eye Work?
  • We will make a simplification: The image is at the focal point.

Lens

Retina

EYE

how do we correct vision problems
How Do We Correct Vision Problems?
  • Scientists and engineers have found ways to solve these problems.
      • Corrective lenses.
        • Glasses
        • Contacts
what is near sightedness
What is Near-Sightedness?
  • The eye is too long and the lens focuses light in front of the retina.

Lens

Retina

EYE

what is far sightedness
What is Far-Sightedness?
  • The eye is too short and the lens focuses light behind the retina.

Lens

Retina

EYE

a converging lens corrects far sightedness
A Converging Lens Corrects Far-sightedness

Converging Lens

Lens

Retina

EYE

engineers clear our view
ENGINEERS CLEAR OUR VIEW
  • Thanks to Engineering and Science, millions of people have improved vision.
materials list
Materials List
  • Two Laser Pointers (or other light sources)
      • Target Superstore for about $12.00 a piece.
  • Knox gelatin
      • 32 Envelopes for $10.00.
      • Double the amount of gelatin in the recipe, this makes it very firm. Don’t add sugar or coloring.
      • Put wax-paper into the pan before filling with gelatin so you can remove the gelatin in one piece.
  • Converging and Diverging Lenses (optional)
      • Edmund Scientific <www.scientificsonline.com>
      • ranges from cheap to very expensive.
demonstration
Demonstration
  • Prepare gelatin the night before to allow it to set up.
    • Put wax paper into the gelatin pan so you can remove the gelatin out of the pan in one piece.
  • Refraction demonstration.
    • Cut the gelatin with a sharp knife so you can shine lasers into a smooth flat surface. Do not use a serrated knife to cut the gelatin, the surfaces must be as smooth as possible to minimize reflections at the surface.
    • Shine a laser into the gelatin at an angle (like the sun picture).
    • Move the laser (or gelatin) around to see different refraction angles.
  • Lens demonstration.
    • Shine parallel lasers through a diverging lens into the gelatin to see the divergence.
    • Shine parallel lasers through a converging lens into the gelatin to see the convergence to a focal point.
    • If you don’t have any lenses, cut lens shapes out of the gelatin for this part. It still works pretty well.
  • Eye demonstration.
    • Follow the figures and place a converging lens so that the laser focus on a “retina.” Move the lens closer and further from the “retina” to simulate farsightedness and nearsightedness.
    • Correct the vision with the appropriate lens.
  • Conclusion.
    • Cut odd shapes out of the gelatin and let the kids shine lasers into them. Be creative!