Prism works on the principle of :

Options

A. Reflection
B. Refraction
C. Dispersion
D. Diffraction

Answer

To solve the question "Prism works on the principle of:", we will analyze the properties of a prism and the underlying optical principles involved.

### Step-by-Step Solution:

1. **Understanding the Structure of a Prism**:
- A prism is a transparent optical element with at least two flat surfaces that are inclined at an angle to each other. Typically, prisms are triangular in shape.

2. **Identifying the Medium**:
- Prisms are often made from materials like glass or plastic, which have different refractive indices compared to air.

3. **Principle of Refraction**:
- When light travels from one medium to another (e.g., from air to glass), it bends at the interface due to a change in speed. This bending of light is known as refraction.

4. **Dispersion of Light**:
- A prism can separate white light into its constituent colors (red, orange, yellow, green, blue, indigo, violet) due to the different degrees of refraction for different wavelengths of light. This phenomenon is called dispersion.

5. **Conclusion**:
- The primary principle that governs the operation of a prism is refraction. While dispersion occurs as a result of refraction, it is not the principle itself. Therefore, the correct answer to the question is that a prism works on the principle of refraction.

### Final Answer:
Prism works on the principle of **refraction**.

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