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    Surfacing - Exam Revision Help

    Currently studing year two of SMC optical techian, was woundering if there's anything that anyone could advise me on revising ? dont really work in a surfacing plant, know the main headings what i...
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    Help Needed With Sph Cyl Forms

    I am revising for my smc exam next week, and having trouble understanding
    this question

    Am astigmatic prescription requires a vertical power of +4.25 and a horizontal power of +6.75 ...
    ...
  3. Help Needed With Smc Course ... Angles Into Prism Dioptres!

    Any help would be greatful!

    Having trouble with angles with 30' by it ...

    e.g

    convert this angle into a prism dioptre

    2 degrees 30'
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