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Silvering of Plano-Convex Lens

  1. Dec 28, 2014 #1
    If the plane surface of a plano-convex lens in silvered then which of the following statements is true?

    1. it acts like a convex mirror
    2. it acts like a concave mirror
    3. it acts like a concave lens
    4. no change

    my attempt---

    the incident ray on the convex surface of the plano-convex will first converge (refract) then reflect from silvered plane surface towards the first surface and then from there it will diverge (refract again) towards the incident side only.

    so i came to a conclusion that the combination is diverging on the same side as object and thus it acts like a Convex Mirror

    but my book give the answer as a concave mirror and the same answer i get after browsing the net but could not find a proper explanation for it

    can someone please help me out asap as my exams are pretty much close now.....
  2. jcsd
  3. Dec 28, 2014 #2
  4. Dec 28, 2014 #3


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  5. Dec 29, 2014 #4


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    Are you sure? In your diagram, make sure you draw quite modest refractions so that you don't confuse yourself.
  6. Dec 29, 2014 #5
    @haruspex i think i kind of get what you want to say that angle of refraction are not very much large.....
    so the diagram given above by @ehild would be an ideal diagram
    and going by it it is pretty much clear that the incident rays converge on the same side on a point on the pricipal axis and hence it acts like a Concave Mirror
    confirm it if you agree.....
  7. Dec 29, 2014 #6


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