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The image of the point (1, 6, 3) with respect to the line x1=y−12=z−23\frac{x}{1}=\frac{y-1}{2}=\frac{z-2}{3} is

Solution

✅ Correct Option: 1

A general point on the line is (t, 1+2t, 2+3t)(t,\,1+2t,\,2+3t). The joining vector from (1,6,3)(1,6,3) is (t−1, 2t−5, 3t−1)(t-1,\,2t-5,\,3t-1).

Setting its dot product with (1,2,3)(1,2,3) to zero gives 14t=1414t=14, so t=1t=1 and the foot is (1,3,5)(1,3,5).

The image is 2(1,3,5)−(1,6,3)=(1,0,7)2(1,3,5)-(1,6,3)=(1,0,7).

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