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Homework Help: Virtual image on the perpendicular

  1. Aug 15, 2016 #1
    1. The problem statement, all variables and given/known data
    The book ("Real World Physics") says
    A virtual image in a plane mirror is on the perpendicular from the object to the mirror

    2. Relevant equations
    I know that the normal line is perpendicular to the surface of the mirror
    And I know that the angle of the incidence and reflection are the same degrees as each other with respect to the normal.. But I don't get what they mean by the sentence above

    Plane_mirror.png [wikicommons image]
    3. The attempt at a solution
    I don't see any right angles in the image above and I can't visualise any when I look in the mirror. I doubled check to make sure that perpendicular always means at a right angle.. and it does... Can someone explain what is meant by this? Thank you!
  2. jcsd
  3. Aug 15, 2016 #2


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    Science Advisor

    Draw a line from A to A'. What angle does it make with the mirror?
  4. Aug 15, 2016 #3
    So what it is saying is that something across from the mirror will look like it is across from the mirror in the reflection? Or am I misunderstanding?
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