The angle between the original path of the incident ray and the emergent ray coming out of a prism is called angle of

Options

A. incidence
B. reflection
C. prism
D. deviation

Answer

To solve the question, we need to understand the concept of light rays passing through a prism and the angles involved in this process.

### Step-by-Step Solution:

1. **Understanding the Incident Ray and Emergent Ray**:
- When a light ray strikes a prism, it is referred to as the incident ray. After passing through the prism, the light ray exits and is called the emergent ray.

2. **Identifying the Angles**:
- The angle of incidence is the angle between the incident ray and the normal (an imaginary line perpendicular to the surface at the point of incidence).
- The angle of emergence is the angle between the emergent ray and the normal at the point where the ray exits the prism.

3. **Defining the Angle of Deviation**:
- The angle of deviation is defined as the angle between the original path of the incident ray (extended) and the path of the emergent ray (also extended).

4. **Visualizing the Angles**:
- To visualize this, if you draw the incident ray and extend it in the direction it was originally traveling, and then draw the emergent ray, the angle formed between these two extended lines is the angle of deviation.

5. **Conclusion**:
- Therefore, the angle between the original path of the incident ray and the emergent ray coming out of a prism is called the **angle of deviation**.

### Final Answer:
The angle between the original path of the incident ray and the emergent ray coming out of a prism is called the **angle of deviation**.

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