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Let $Q$ be the image of the point $P(-2,1,-5)$ in the plane $3 x-2 y+2 z+1=0 .$ Consider the following:
1 . The direction ratios of the line segment $\mathrm{PQ}$ are $ < 3,-2,2>$.
2 . The sum of the squares of direction cosines of the line segment $\mathrm{PQ}$ is unity. Which of the above statements is/are correct?
Options:
1 . The direction ratios of the line segment $\mathrm{PQ}$ are $ < 3,-2,2>$.
2 . The sum of the squares of direction cosines of the line segment $\mathrm{PQ}$ is unity. Which of the above statements is/are correct?
Solution:
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Verified Answer
The correct answer is:
Both 1 and 2
From (i) above, 1 is correct. We know that, Sum of direction cosines of the line segment $\mathrm{PQ}=1$.
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