State whether the following statement is true or false ? If the angle of incidence is greater than the critical angle, light is not refracted at all, when it falls on the surface from a denser medium to a rarer medium.

Answer

To determine whether the statement is true or false, we can analyze the conditions given in the question step by step.

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Angle of Incidence**: This is the angle at which the incoming light ray strikes the surface.
- **Critical Angle**: This is the angle of incidence above which total internal reflection occurs when light travels from a denser medium to a rarer medium.

2. **Identifying the Mediums**:
- The question states that light is moving from a denser medium to a rarer medium. For example, if light is moving from water (denser) to air (rarer).

3. **Condition Given**:
- The angle of incidence is greater than the critical angle. This means the angle at which the light strikes the surface exceeds the critical angle specific to the two mediums involved.

4. **Behavior of Light**:
- When the angle of incidence is greater than the critical angle, the light does not pass into the rarer medium. Instead, it reflects back into the denser medium. This phenomenon is known as **total internal reflection**.

5. **Conclusion**:
- Since the light does not refract at all when the angle of incidence is greater than the critical angle, the statement in the question is **true**.

### Final Answer:
The statement is **true**.

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