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ABO # STWQO032-3
APPROVED for 2 Hour(s) of CE
New York - (#09-02) DISP
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Ontario Opticians (#2673 EG/CL)
APPROVED for 2 Hour(s) of CE |
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These are not rules that you need to memorize. They are something that you can demonstrate for yourself, either with diagrams or with a lens. Use a spherical plus lens with a fair amount of power or a hand-held magnifier. Hold the lens at arms length and look through it at things that are various distances from it. You need a strong lens so that you will be able to see things that are farther away than it's focal length, as well as things that are closer. You do not want to hold it right in front of your eye because then you, the observer, are interacting with the lens and the objects. You want your eye to be outside of the focal length of the lens. |
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