Mathematics · 2021
JEE Main · 18 March 2021, Shift 2 · Q88
Let the mirror image of the point (1, 3, a) with respect to the plane r ·(2 i - j + k )- b =0 be (-3,5,2). Then, the value of | a + b | is equal to \…
Let the mirror image of the point ($\displaystyle 1$, $\displaystyle 3$, a) with respect to the plane $\displaystyle \overrightarrow{\mathrm{r}} \cdot(2 \hat{i}-\hat{j}+\hat{k})-\mathrm{b}=0$ be $\displaystyle (-3,5,2)$. Then, the value of $\displaystyle |\mathrm{a}+\mathrm{b}|$ is equal to \_\_\_\_.
Official answer
1
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JEE Main 2021 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.