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Combination of lens and mirror

  1. May 25, 2015 #1
    1. The problem statement, all variables and given/known data
    a convex lens forms a real image of a point object at a distance of 50 cm from convex lens. a concave lens is placed 10 cm behind convex lens on image side. on placing a plane mirror on the image side and facing the concave lens it is observed that final image now coincides with the object itself. find focal length of concave lens.
    2. Relevant equations
    1/f = 1/v - 1/u

    3. The attempt at a solution
    v= +50cm for convex lens as real image is formed on opposite side to object.
    this acts as object for concave lens
    unable to proceed further
  2. jcsd
  3. May 25, 2015 #2


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    Gold Member

    Try drawing a ray diagram.
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