A parallelogram PQRS has two diagonals PR and QS whose lengths are 20 cm and 28cm, respectively. The diagonals PR and QS bisect at point O. Find the length of PO and QO.
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A converging lens is said to have positive focal length. A converging lens causes exiting rays to be more convergent coming out than they were entering the lens. A diverging lens is said to have negative focal length.
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