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Concave mirror

  1. Apr 2, 2009 #1
    concave mirror!!!

    1. The problem statement, all variables and given/known data

    The real image produced by a concave mirror is found to be 0.756 times the size of the object. If the distance from the mirror to the screen on which the image appears is 0.764 m , what is the focal length of the mirror?

    2. Relevant equations

    (a) 1 /do + 1/di = 1/f

    (b) image height / object height=m = - di/do

    (c) - object height / image height = do / di

    3. The attempt at a solution
    m= 0.756 = -hi / ho

    so to use equation "c"

    i inverted --- > -1/0.756
    then set it euqal to rest of the equation so --> -1/.756 = do / .764
    do= -1.01058 m

    then i used equation "a"

    (1/-1.01058) + (1/.764) = 1/f and solved for f

    Answer was Wrong. Please tell me what I need to do. Thank you!
     
  2. jcsd
  3. Apr 2, 2009 #2

    rl.bhat

    User Avatar
    Homework Helper

    Re: concave mirror!!!

    I got the answer 0.435 m. Is it correct? If so check your sign convention.
     
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