Mirrors

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Mirrors

• Law of Reflection
• states that the angle of reflection is equal to
  the angle of incidence

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• A ray diagram
• shows how rays change direction when they strike
  mirrors and pass through lenses

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• Incident ray
• Incoming ray (ray approaching the mirror)
• Angle of incidence
• Angle the incident ray makes with a line drawn
  perpendicular to the surface of the mirror

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• Angle of reflection
• The angle the reflected ray makes with the
  perpendicular line.

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Plane Mirror (Create Image)

• A mirror with a flat surface is a plane mirror.
• What are some examples of plane mirrors?

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Quick Question

• How does a plane mirror form an image?
• Use a diagram to help explain your answer

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Plane Mirrors

• The image is virtual, right side up and reversed.
  
• What is a virtual image?

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• Virtual images can not be projected on a screen.
• Why?

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Concave Mirrors

• A concave mirror is curved inward.
• They can produce both a virtual or a real image.
• Focal Point
• The point at which light rays meet.

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Quick Question

• What is a real image?

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• Real images can be projected on a screen.

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Quick Question

• How are you going to remember the difference
  between a real and virtual image?
• Why are concave mirrors often used in automobile
  headlights and flashlights?

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Convex Mirror

• A convex mirror is bent outward. The object is
  virtual and appears smaller and upright.
• Convex mirrors spread out light.

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Question Time

• Answer the 19.1 assessment questions on page 573.
• Dont forget the writing in science!

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Refraction

• The index of refraction for a material is the
  ratio of the speed of light in a vacuum to the
  speed of the light in the material.

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• When light enters a new medium at an angle, the
  change in speed causes the light to bend or
  refract.

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Concave Lens

• curved inward at the center
• thickest part at the outside edges
• The light rays are spread out.
• Forms a small, upright virtual image.

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Convex Lens

• A convex lens is curved outward at the center and
  is thinnest at the outer edge.
• Convex lenses form either real or virtual images.
• The real images is upside down.

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Complete this chart include diagrams and type(s)
of image(s)
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Worksheet Time

• Read and underline
• Look at data tables
• Answer questions

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Question Time

• Complete 19.2 assessment questions 1-6
• Create your own vocabulary list for sections 19.1
  and 19.2
• Words can be found on page 594.

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Total Internal Reflection

• Total internal reflection is the complete
  reflection of a light ray back into its original
  medium.
• The critical angle is the angle of incidence that
  produces an angle of refraction of 90 degrees.
• Fiber Optics