Let \( Q \) be the mirror image of the point \( P(1,0,1) \) with respect to the plane \( S: x+y+... VIDEO
Let \( Q \) be the mirror image of the point \( P(1,0,1) \) with respect to the plane \( S: x+y+z=5 \). If a line \( L \) passing through \( (1,-1,-1) \), parallel to the line \( P Q \) meets the plane \( S \) at \( R \), then \( Q R^{2} \) is equal to
(a) 2
(b) 5
(c) 7
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