Lenses

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Lenses

• Image Formation by a Lens
• Ray Diagrams

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How Much Detail Can We See?

• Its all in the angle!

• The larger the angle that we can view something,
  the more detail we can see.

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How Much Detail Can We See?

• A magnifying glass increases the angle of view
  and allows more detail to be seen.

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Image Formation by a Lens
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Image Formation by a Lens

• Real Image
• Virtual Image

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Ray Diagrams (Converging)

• 1. A ray parallel to the principal axis passes
  through the focal point after refraction by the
  lens.

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Ray Diagrams (Converging)

• 2. A ray through the center of the lens does not
  change direction.

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Ray Diagrams (Converging)

• 3. A ray through the focal point in front of the
  lens emerges parallel to the principal axis after
  refraction by the lens.

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Ray Diagrams (Converging)
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Ray Diagram (Diverging Lens)