Light Exploration

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Light Exploration

• Write On
• Grade

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Learner Expectation

• Content Standard 14.0 Energy
• The student will investigate energy and its uses.
• Learning Expectations
• 14.1 Know that energy exists in many forms.
• 14.2 Recognize the characteristics of light
  energy and sound energy.

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In this activity you will

• Observe that light passes through some materials
  easily,some materials partially, and some not at
  all.
• Classify materials according to the way light
  passes through them.

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Materials and Light

• There are three different types of materials that
  light will or will not pass through.
• Transparent
• Translucent
• Opaque

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Transparent Light

• Materials that you can see through allow almost
  all of the light to pass through.
• Light is allowed through with very little bending
  or scattering of the rays of light.

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Examples of Transparent Materials

• Clear glass
• Clean water
• Clear plastic

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Question

• Why is transparent tape called transparent tape?

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Answer

• You can see through it or light rays are allowed
  to pass through it.
• I can completely see my leftovers wrapped in
  transparent plastic wrap.

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Translucent Materials

• Materials that allow only some light to pass
  through.
• Objects allow light to pass through, but they
  scatter the rays so much that you cannot get a
  clear view of what is on the other side.
• Examples of Translucent Materials
• Thin fabrics
• Frosted glass
• Thin paper

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Question

• Why is wax paper translucent?

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Answer

• You can see some light, but you cannot see
  through it.
• I can barely see my leftovers wrapped in wax
  paper.

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Opaque Materials

• Light cannot pass through these materials.

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Examples of Opaque Materials

• Brick
• Metal
• Thick paper
• Aluminum Foil
• Wood
• Stones

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Quick Facts about Opaque Materials

• These objects will cast a shadow when lit up.
• Brick, metal, and thick paper stop light
  completely.
• This is why you cannot see your leftovers
  wrapped in aluminum foil!

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Writing Activity

• Write a paragraph that includes a definition and
  example of transparent , translucent and opaque
  light.