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Find the distance from the mirrors for 4 reflections

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  1. May 19, 2016 #1
    1. The problem statement, all variables and given/known data
    Two plain mirrors are put parallelly and 20 cm from each other. A source of light is put between the mirrors, 5 cm away from one. Find the distance from the mirrors of 4 first reflections.

    2. Relevant equations
    a1=a2 The distance of the object from the mirror and the reflection from the mirror is equal.

    3. The attempt at a solution
    http://s32.postimg.org/507dau85h/image.png
    is it right?
     
  2. jcsd
  3. May 19, 2016 #2

    CWatters

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    I know what a "first reflection" is but I'm not sure how you can have four of them in this situation. I think two are first reflections and two are second reflections. Check the distance for the one I marked incorrect.

    image.png
     
  4. May 19, 2016 #3
    5 should be replaced with 10. Am I right?
     
  5. May 19, 2016 #4

    CWatters

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