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Lens maker formula

  1. Aug 1, 2012 #1
    Hi friends,

    I've a very simple doubt.

    The lens maker equation, why is it called lens maker equation?
    What is the reason behind that?

    thank you in advance.
  2. jcsd
  3. Aug 1, 2012 #2


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    Staff Emeritus
    Science Advisor

    I keep seeing this phrase. What do you mean by "i have a doubt"?

    I believe because it is used by lens makers. To my knowledge it's a much easier way of finding the power of a lens than trying to use Snell's law and such.
  4. Aug 1, 2012 #3

    Doc Al

    User Avatar

    Staff: Mentor

    I believe he means: "I have a question".

    I also find it an odd turn of phrase, but it is very common.

    FYI: In the US at least, the phrase "I have a doubt" often carries a connotation similar to "I think something fishy is going on" or "I think there's something wrong here". So don't be surprised if people wonder what you mean if you use such a phrase.
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