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Optics, the resulting power of the lens .?

  1. Nov 3, 2012 #1
    optics, the resulting power of the lens.....??

    a thin lens , made of refractive index 1.5,has a front surface +11 d power and back surface -6d ..if this lens is submerged in a liquid of refractive index 1.6, the resulting power of the lens is.....

    a)-1 dioptre

    b)+1 dioptre

    c)-5 dioptre

    d)+5 dioptre

    plzzzz answer ,,,and why plz ..its emergency:frown:..
     
  2. jcsd
  3. Nov 4, 2012 #2

    tiny-tim

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    hi mero coactail! welcome to pf! :wink:
    what equations are relevant here?

    show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:
     
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