Results 1 to 2 of 2

Thread: Lens maker's equation

  1. #1
    OptiBoard Novice
    Join Date
    Aug 2010
    Location
    Sacramento
    Occupation
    Dispensing Optician
    Posts
    5

    Confused Lens maker's equation

    I am studying optical theory from notes given to me from a friend of a friend. Due to this some concepts are unclear. I am trying to figure out how to calculate practice problems, but their notes are not complete enough to figure out how to do them and I am unable to find the info in any book or online info. So here is a sample of the questions I am looking at.

    Given info:
    F1=+1.75
    F2=-8.50 @ 135
    F2= -12.50 @ 45
    Ft=?
    Your index is 1.66.


    Any ideas? The section is labeled Nominal lens equation with lens maker compensation, if that helps. There are no radii, so I can't use the formula in my book. Also, the equation in the notes I have says: F(nm)=[(n'-1)F(lm)]/0.53 It has no explanation for what these stand for, but I know that n' is the index of refraction and 1 is the constant of air. 0.53 is the conversion used to compensate for different indices. Even with all this information I am at a loss. Can anyone help?

  2. #2
    ATO Member HarryChiling's Avatar
    Join Date
    Apr 2005
    Location
    Nowhereville
    Occupation
    Other Eyecare-Related Field
    Posts
    7,765
    Your questioned was answered correctly here:

    http://www.optiboard.com/forums/show...940#post354940

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. equation for inducing prism in steep base curved lenses
    By CaseyConrad in forum General Optics and Eyecare Discussion Forum
    Replies: 5
    Last Post: 06-17-2009, 04:19 PM
  2. Internet Glasses proves Ryser Equation...
    By Uncle Fester in forum General Optics and Eyecare Discussion Forum
    Replies: 14
    Last Post: 05-08-2008, 07:23 PM
  3. equation to figure out maximum frame size
    By rolandclaur in forum General Optics and Eyecare Discussion Forum
    Replies: 2
    Last Post: 03-08-2007, 12:16 PM
  4. Supply Scanner lens, CCD lens, Optical Lens
    By cnsupplier in forum Optical Marketplace
    Replies: 0
    Last Post: 01-19-2005, 02:53 AM
  5. Projection lens, CCD lens, Scanner Lens, Enlarging Lens
    By cnsupplier in forum Optical Marketplace
    Replies: 0
    Last Post: 01-09-2005, 08:25 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •