Q is any point on the line ∴ coordinates of Q are (–3µ + 1, µ – 1, 5µ +2) Direction ratios of PQ are –3µ – 2, µ – 3, 5µ – 4 PQ || plane ∴ PQ is perpendicular to normal ∴ 1(–3µ – 2) – 4(µ – 3) + 3(5µ – 4) = 0 ⇒ µ =