Physics · 2021
JEE Main · 26 February 2021, Shift 2 · Q17
The incident ray, reflected ray and the outward drawn normal are denoted by the unit vectors a, b and c respectively. Then choose the correct…
The incident ray, reflected ray and the outward drawn normal are denoted by the unit vectors $\displaystyle \vec{a}, \vec{b}$ and $\displaystyle \vec{c}$ respectively. Then choose the correct relation for these vectors.
Official answer
(2)
$\displaystyle \overrightarrow{\mathrm{b}}=\overrightarrow{\mathrm{a}}-2(\overrightarrow{\mathrm{a}} \cdot \overrightarrow{\mathrm{c}}) \overrightarrow{\mathrm{c}}$
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JEE Main 2021 Physics question, with the answer from NTA’s final answer key. Where our answers come from.