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         Investigation #1
• 1. Shadows require light.
• 2. Light travels in a straight line.
  It does not bend around an object.
• 3. An object has a shadow
  because it affects light in some
  way. It blocks or deflects light.
        Investigation #1
• 4. There are faint shadows and
  strong shadows, depending on
  how much an object blocks or
  changes the light that passes
  through the object.
        Investigation #1
• 5. The shape of a shadow
  depends on the shape and
  orientation of the object casting
  the shadow.
         Investigation #1
• 6. We usually see shadows as
  two-dimensional shapes on a
  surface, but shadows also fill
• 7. Light interacts with matter.
         Investigation #1
• 8. Objects placed close to the
  light source – shadow is big and
  blurry (fuzzy).
• 9. Objects placed close to the
  screen – shadow is small and
  sharp (clear).
         Investigation #1
• 10. A ball or sphere has the
  same shadow no matter how you
  change its orientation (position).
          Investigation #2
• 1. Light travels in straight lines.
  When the light is blocked by an
  object in its path, light cannot get
  behind the object. That is why a
  shadow forms.
         Investigation #2
• 2. We can explain the shadows
  we see by using diagrams. The
  straight lines show some possible
  paths that light can follow.
        Investigation #2
• 3. A narrow light source makes a
  sharp shadow.

• 4. A wide light source makes a
  fuzzy shadow.
         Investigation #2
• 5. If light from part of a source
  reaches a certain place, that
  place is not fully lit or fully
  shaded; it is partially shaded.
        Investigation #2
• 6. An object that receives light
  from more than one light source
  can have more than one shadow.
         Investigation #3
• 1. We used a light beam to
  observe how light interacts with
• 2. Saw light reflected, scattered,
  transmitted and absorbed.
         Investigation #3
• 3. Observed three optical
  properties of matter: transparent,
  translucent and opaque.
         Investigation #3
• 4. A material can reflect the light
  beam into one beam, a diffuse
  glow or something in between.
         Investigation #3
• 5. A material can absorb the light
  beam, completely or partially.

• 6. A material can transmit the
  light beam largely unchanged.
  (stays a beam)
         Investigation #3
• 7. A material can transmit light as
  a diffuse glow.
        Investigation #4
• 1. Shadow size can be predicted.
         Investigation #4
• 2. Identifying variables and
  making measurements are
  important parts of the scientific
        Investigation #4
• 3. In an experimental system
  there are independent and
  dependent variables.
        Investigation #4
• 4. Tables and graphs are ways to
  communicate data.
        Investigation #4
• 5. Studying graphs helps us see
  what the data means.
Investigation #4

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