Images in Plane Mirrors

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Images in Plane Mirrors
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Properties of Images in Plane Mirrors

• Writing reflectively activity
• Object vs Image Distance

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Characteristics in Plane Mirrors

• Distance from object to mirror equals distance
  from image to mirror
• Upright
• Left-Right reversal
• Virtual image

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• An object in front of the mirror is the object.
  The appearance of the object in the mirror is
  called the image.
• Since light does not originate behind the mirror
  (but only appears to), the image in a plane
  mirror is called a virtual image point.

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• NOTE the human brain can only comprehend light
  rays travelling in straight line paths

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• Lateral inversion the orientation of an image
  in a plane mirror appears to be backwards and in
  the reverse order.

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• LOST Image Characteristics
• 1. Location the image can be closer, farther, or
  the same distance as the object.
• 2. Orientation - the image can be upright (erect)
  or inverted (upside-down) compared with the
  object
• 3. Size the image can be smaller, larger, or the
  same size (relative to the object)
• 4. Type the image can be real or virtual (a real
  image will form on a screen)

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• The four characteristics of an image in a plane
  mirror are (SALT)
• An image in a plane mirror is the same size as
  the object. (Size)
• 2. The image is upright. (Attitude)
• 3. The location of the image is the opposite of
  the mirror relative to the object. (Location)
• 4. It is a virtual image. (Type)

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• 1. In your own words, describe what is meant by
  the term virtual image.
• 2. You stand 1.8 m in front of a plane mirror as
  you are brushing your teeth. Use LOST to
  describe the characteristics of the image.
• 3. You are wearing a T-shirt that has the words
  OPTICS on it. You stand in front of a plane
  mirror. Write in your notebook how this word
  appears to you as you look in the mirror.

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• 4. Copy Figure 12 into your notebook. Use a
  ruler and a protractor to draw normals and
  reflected rays to locate the apparent source
  behind the mirror. (Refer to Figure 5 in this
  section for help with this.) Verify your answer
  using an object-image line and lines of equal
  length that are perpendicular to the mirror.
  
  

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• 5. Copy all three parts of Figure 13 into the
  notebook leaving plenty of space around each
  part. Draw object-image lines and lines of equal
  length that are perpendicular to the mirror to
  determine the image of each object. Use SALT to
  describe the characteristics of each image.

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• 6. a) What does the acronym SALT stand for?
• b) In your own words, write a brief
  explanation of each of these four terms.
• 7. Emergency vehicles make use of lateral
  inversion when painting words and pictures on the
  hoods. Why do you think this is so? Write a
  brief explanation, including examples of how this
  is used in your community.

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• 9. Your parents have brought a new mirror for
  your bedroom. At first, you are dismayed because
  the mirror is only half your height and you do
  not think that you will be able to see an image
  of your entire body. You immediately notice,
  however, that the mirror does allow you to see
  your entire body. Copy Figure 14 into your
  notebook and use light rays to show that you
  really can see your feet in the mirror the way it
  is set up.

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• 11. A periscope is a device that is used to see
  around corners, over a wall, or above water.
  Simple periscopes contain two plane mirrors.
• a) Predict how these mirrors are arranged.
• b) Draw a diagram to illustrate how such a
  periscope would work.