Provides digital solution of the thin lens equation:
The lens that is thin enough to ignore its own volume can be described by equation
where O is the distance between object and lens, I is the distance between image and lens, and F is the focus length of lens.
The applet contains fields for all 3 values and computes missing value that must be left empty. If all values are given, it computes and, if needed, corrects F.
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