The incident ray, reflected ray and the outward drawn normal are denoted by the unit vectors $\overrightarrow a $, $\overrightarrow b $ and $\overrightarrow c $ respectively. Then choose the correct relation for these vectors.
$\overrightarrow b $ = $\overrightarrow a $ + 2$\overrightarrow c $
$\overrightarrow b $ = $\overrightarrow a $ $-$ 2 ($\overrightarrow a $ . $\overrightarrow c $)$\overrightarrow c $
$\overrightarrow b $ = 2$\overrightarrow a $ + $\overrightarrow c $
$\overrightarrow b $ = $\overrightarrow a $ $-$ $\overrightarrow c $
