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 Form 4 Physics Questions and Answers on Thin Lenses

In an experiment, a pin, a converging lens and a plane mirror are arranged as shown in figure 4. The distance between the pin and the plane mirror is L cm while the distance between the lens and the plane mirror is q cm. The position of the pin is adjusted until its tip coincides with its real image.
figthinlenses25520201607.JPG
State the focal length of the lens.

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