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Thread: Angle of Rotation of a Plane Mirror?

  1. #1 Angle of Rotation of a Plane Mirror? 
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    Can someone please tell me the relationship between the angle of rotation of a plane mirror and the angle through which the refracted ray is turned when the angle of incident is constant.


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  3. #2  
    Forum Professor jrmonroe's Avatar
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    Does this diagram describe the scenario?



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  4. #3  
    Universal Mind John Galt's Avatar
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    I am confused. If it is a mirror, where does the refraction enter into it?
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  5. #4  
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    Quote Originally Posted by Ophiolite
    I am confused. If it is a mirror, where does the refraction enter into it?
    You should be more confused than that. Change "refracted" to "reflected" and the OP still doesn't make any sense
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  6. #5  
    Universal Mind John Galt's Avatar
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    Quote Originally Posted by DrRocket
    Quote Originally Posted by Ophiolite
    I am confused. If it is a mirror, where does the refraction enter into it?
    You should be more confused than that. Change "refracted" to "reflected" and the OP still doesn't make any sense
    On reflection, you are correct.
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  7. #6  
    Forum Professor jrmonroe's Avatar
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    I think I know what the OP wants, and the answer is available from my diagram.
    Grief is the price we pay for love. (CM Parkes) Our postillion has been struck by lightning. (Unknown) War is always the choice of the chosen who will not have to fight. (Bono) The years tell much what the days never knew. (RW Emerson) Reality is not always probable, or likely. (JL Borges)
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  8. #7  
    . DrRocket's Avatar
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    Quote Originally Posted by jrmonroe
    I think I know what the OP wants, and the answer is available from my diagram.
    Good luck. I don't think the OP knows what the OP wants.

    I doubt that it is simply "the angle of incidence equals the angle of reflection", or even Fermat's principle of least time.
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  9. #8  
    Forum Professor jrmonroe's Avatar
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    I think he means, when the mirror rotates through x degrees, the reflecting ray rotates through y degrees. So, what the function for y=f(x).
    Grief is the price we pay for love. (CM Parkes) Our postillion has been struck by lightning. (Unknown) War is always the choice of the chosen who will not have to fight. (Bono) The years tell much what the days never knew. (RW Emerson) Reality is not always probable, or likely. (JL Borges)
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  10. #9  
    . DrRocket's Avatar
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    Quote Originally Posted by jrmonroe
    I think he means, when the mirror rotates through x degrees, the reflecting ray rotates through y degrees. So, what the function for y=f(x).
    ????

    The angle of incidence is still equal to the angle of reflection.

    Your "x" is not well-defined since the mirror can move in three dimensions so that there os no clear axis about which it must rotate. Moreover, if you pick an axis that leaves open the question of the initial angle.
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  11. #10  
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    Oh sorry if I made myself unclear I found the answer anyway, it doubles, thanks anyway. for anyone who wants to know I found the answer Here http://www.splung.com/content/sid/4/page/planemirrors
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