JELL-O OPTICS Prepared by University of Utah Departments for Utah - - PowerPoint PPT Presentation

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JELL-O OPTICS Prepared by University of Utah Departments for Utah - - PowerPoint PPT Presentation

Jan 22, 2024 286 likes •518 views

JELL-O OPTICS Prepared by University of Utah Departments for Utah Schools Provided to you by: Supported by the National Science Foundation under grant no. DMR-1121252 CFDA NO. 47.049 Review the Properties of Light How does light travel?

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Prepared by University of Utah Departments for Utah Schools

Provided to you by: Supported by the National Science Foundation under grant no. DMR-1121252 CFDA NO. 47.049

JELL-O OPTICS

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Review the Properties of Light

  • How does light travel?

– In a straight line – In waves

  • What happens when it strikes surface?

– It will be

  • Reflected
  • Refracted or
  • Absorbed
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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!
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REFRACTION

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What do lenses do?

Diverging Lenses (Concave shaped)

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Converging Lenses (Plano-convex lens)

What do lenses do?

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How Does Your Eye Work?

  • Objects form an upside-down image on the

retina.

Retina Lens

EYE

  • bject

image

Focal point Focal point

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How Does Your Eye Work?

  • We will make a simplification: The image is

at the focal point.

Retina Lens

EYE

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How Do We Correct Vision Problems?

  • Scientists and engineers have found ways to

solve these problems.

  • Corrective lenses.

– Glasses – Contacts

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What is Near-Sightedness?

  • The eye is too long and the lens focuses

light in front of the retina.

Retina Lens

EYE

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A Diverging Lens Corrects Near-sightedness

Retina Lens

EYE

Diverging Lens

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What is Far-Sightedness?

  • The eye is too short and the lens focuses

light behind the retina.

Retina Lens

EYE

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A Converging Lens Corrects Far-sightedness

Retina Lens

EYE

Converging Lens

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ENGINEERS CLEAR OUR VIEW

  • Thanks to Engineering and Science,

millions of people have improved vision.

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Experiments

  • Prisms:

The purpose of a prism is to bend light. The prism can be used to demonstrate reflection, refraction, and total- internal reflection.

Images courtesy of discoveryeducation.com

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Experiments

  • Plano-convex lens:

The plano-convex lens can be used to demonstrate the concepts of refraction and focusing.

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Experiments

  • Bi-concave lens: A

bi-concave lens works oppositely to a bi-convex or plano-convex lens in that rays that exit the lens diverge rather than converge.

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Experiments

  • The plano-convex

lens can be used to demonstrate the concepts of refraction and focusing.

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Experiments

  • The rod can be used to

demonstrate the concepts of reflection, refraction, absorption (for colored Jell-O) and total‐internal reflection.

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Experiments

  • The glass lens and

prism set allows a variety of ways to demonstrate and study the behavior of light. One side is frosted to aid in revealing the path of light.

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Experiments

  • The clear acrylic

refraction cells are excellent for showing refraction and internal reflection in water and

  • ther liquids and to
  • bserve the refractive

index.

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Videos

Jell-O Optics videos are plentiful on YouTube. Here are a few:

  • U of U Outreach Team (also in Spanish):

Part 1: http://www.youtube.com/watch?v=ToLKLDtLo80 Part 2: http://www.youtube.com/watch?v=5Nii9XAv_vg

  • Science Channel: http://www.youtube.com/watch?v=I4pgO3U5luY

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  • WOWLAb: http://www.youtube.com/watch?v=wavxG4ipj6s