Question
What is called reflection of light ? Using a proper diagram, explain about incident ray, reflected ray, angle of incidence, angle of reflection and plane of incidence.
✓
Answer
→ As shown in the figure, above $X Z$ plane, there is optical medium 1 and below this plane there is optical medium 2.
→ When a ray of light $P Q$ travelling in medium 1 strikes on the surface of medium 2 at point $Q$, it gets bounced and then it travels along $Q R$. Here this process of bouncing is called reflection of light, ray $P Q$ is called incident ray, ray $Q R$ is called reflected ray, point $Q$ is called point of incidence (or point of reflection). In short striking ray is called incident ray and bouncing ray is called reflected ray.
→ A Angle made by incident ray with the normal drawn at the point of incidence is called angle of incidence. It is shown by symbol $i$. In above figure, $i=$ $\angle P Q M$.
→ A Angle made by reflected ray with the normal drawn at the point of incidence is called angle of reflection. It is shown by symbol $r$. In above figure, $r=\angle M Q R$.
→ Plane passing through incident ray, normal drawn at the point of incidence and reflected ray is called plane of incidence. In above figure, $A B C D$ is a part of plane of incidence.
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