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Answer each of the following questions in one word or one sentence or as per exact requirement of the question:
If the diagonals of the quadrilateral formed by the lines \( l_{1} x+m_{1} y+n_{1}=0 \), \( l_{2} x+m_{2} y+n_{2}=0, l_{1} x+m_{1} y+n_{1}^{\prime}=0 \) and \( l_{2} x+m_{2} y+n_{2}^{\prime}=0 \) are perpendicular, then write the value of \( l_{1}^{2}-l_{2}^{2}+m_{1}^{2}-m_{2}^{2} \).
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