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Math Help - plane mirror

  1. #1
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    plane mirror

    Draw a diagram illustrating that the minimum size of a plane mirror that shows you your whole body is half your height.
    I don't understand. How does a plane mirror shrink your size? Isn't that for convex/concave?
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    Senior Member vincisonfire's Avatar
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    It doesn't shrink you size.
    The mirror is half your height, suppose the top is at the level of your hair. Then you will be able to see your feet. This is what the statement tells you.
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  3. #3
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    the blue dot is an eye
    First law of reflection, angle of incidence= angle of reflection?
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  4. #4
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    Quote Originally Posted by iamanoobatmath View Post
    I don't understand. How does a plane mirror shrink your size? Isn't that for convex/concave?
    your question says that if the height of plane mirror is half of your height, then only you can see your full height in the mirror.
    If your height is h, then, the height of plane mirror would be h/2.
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