What is angle of reflection?

Options

A. The angle between normal and surface.
B. The angle between normal and reflected ray.
C. The angle between reflected ray and surface.
D. The angle between incident ray and reflected ray.

Answer

### Step-by-Step Solution:

1. **Understanding Reflection**: When light strikes a surface, it can either be absorbed or reflected. In the case of reflection, the light bounces off the surface.

2. **Identifying the Surface**: The surface we are considering is smooth and polished, which allows for regular reflection. Regular reflection means that the reflected rays are parallel to each other.

3. **Drawing the Normal Line**: To analyze the reflection, we draw an imaginary line called the "normal." This line is perpendicular to the surface at the point where the light ray strikes.

4. **Defining the Incident Ray**: The incoming light ray that strikes the surface is called the "incident ray."

5. **Defining the Reflected Ray**: After striking the surface, the light ray that bounces back is called the "reflected ray."

6. **Identifying Angles**:
- The angle between the normal line and the incident ray is called the "angle of incidence" (denoted as \(i\)).
- The angle between the normal line and the reflected ray is called the "angle of reflection" (denoted as \(r\)).

7. **Defining the Angle of Reflection**: The angle of reflection is specifically defined as the angle formed between the normal line and the reflected ray.

8. **Conclusion**: Therefore, the angle of reflection is the angle \(r\) that lies between the normal and the reflected ray.