Parabola

Consider the parabola \(y^{2}=4 x\). Let \(S\) be the focus of the parabola. A pair of tangents drawn to the parabola from the point \(P=(-2,1)\) meet the parabola at \(P_{1}\) and \(P_{2}\). Let \(Q_{1}\) and \(Q_{2}\) be points on the lines \(S P_{1}\) and \(S P_{2}\) respectively such that \(P Q_{1}\) is perpendicular to \(S P_{1}\) and \(P Q_{2}\) is perpendicular to \(S P_{2}\). Then, which of the following is/are TRUE?