Vectors - Perpendicular Projection and Reflection in a Line

Vectors - Perpendicular Projection and Reflection in a Line

TGM Original Questions

The equation of line \({{l}_{1}}\) is given by \(\mathbf{r}=\left( \begin{matrix} 1  \\ -5  \\ 2  \end{matrix} \right)+\lambda \left( \begin{matrix} 14  \\ -2  \\ 5  \end{matrix} \right);\lambda \in \mathbb{R}\) and the point \(A\) has coordinates \(\left( 2,-3,2 \right)\).

  1. Exact shortest distance of \(A\) to \(l\),
  2. Foot of perpendicular of \(A\) to \(l\),
  3. Mirror image of point \(A\) in the line \(l\).

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Answer:(i) \(\frac{\sqrt{41}}{3}\) units (ii) \(\frac{1}{45}\left( \begin{matrix} 73 \\ -229 \\ 100 \\ \end{matrix} \right)\) (iii) \(\frac{1}{45}\left( \begin{matrix} 56 \\ -323 \\ 110 \\ \end{matrix} \right)\)

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