The incident ray

PHYSICS · Single correct · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction

Problem

The incident ray, reflected ray, and outward-drawn normal are denoted by the unit vectors

\vec{a}

\vec{b}

, and

\vec{c}

, respectively. Choose the correct relation between these vectors. (1)

\vec{b}=2\vec{a}+\vec{c}

(2)

\vec{b}=\vec{a}-\vec{c}

(3)

\vec{b}=\vec{a}+2\vec{c}

(4)

\vec{b}=\vec{a}-2(\vec{a}\cdot\vec{c})\vec{c}