The angle of incidence is always equal to the angle of _______

Options

A. Refraction
B. Reflection
C. Incident
D. None of these

Answer

To solve the question, "The angle of incidence is always equal to the angle of _______", we need to refer to the principles of reflection in physics.

### Step-by-Step Solution:

1. **Understanding the Terms**:
- The angle of incidence is defined as the angle between the incident ray (the incoming ray of light) and the normal (an imaginary line perpendicular to the surface at the point of incidence).
- The angle of reflection is defined as the angle between the reflected ray (the outgoing ray of light) and the normal.

2. **Law of Reflection**:
- According to the law of reflection, when a ray of light strikes a reflective surface, the angle of incidence is always equal to the angle of reflection. This can be mathematically expressed as:
\[ \text{Angle of Incidence (I)} = \text{Angle of Reflection (R)} \]

3. **Filling in the Blank**:
- Based on the law of reflection, we can conclude that the angle of incidence is always equal to the angle of reflection. Therefore, the correct answer to fill in the blank is "reflection".

### Final Answer:
The angle of incidence is always equal to the angle of **reflection**.

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