When a ray of light passes from an optically more dense medium to a less dense medium, it

Options

A. goes undeviated
B. bends towards the normal
C. bends away from the normal
D. none of these

Explanation

### Step-by-Step Solution:

1. **Understanding Optical Density**:
- Optical density refers to the refractive index of a medium. A medium with a higher refractive index is considered optically denser, while a medium with a lower refractive index is considered optically less dense.

2. **Identifying the Transition**:
- In this scenario, we are considering a ray of light transitioning from an optically denser medium (higher refractive index) to an optically less dense medium (lower refractive index).

3. **Applying Snell's Law**:
- Snell's Law states that \( n_1 \sin(i) = n_2 \sin(r) \), where \( n_1 \) and \( n_2 \) are the refractive indices of the two media, and \( i \) and \( r \) are the angles of incidence and refraction, respectively.

4. **Refractive Index Relationship**:
- When moving from a denser medium to a less dense medium, the refractive index of the denser medium (\( n_1 \)) is greater than that of the less dense medium (\( n_2 \)). Therefore, we can say \( n_1 > n_2 \).

5. **Determining the Relationship Between Angles**:
- Since \( n_1 > n_2 \), it follows from Snell's Law that \( \frac{n_1}{n_2} > 1 \). This implies that \( \sin(i) > \sin(r) \), leading to the conclusion that the angle of refraction \( r \) must be greater than the angle of incidence \( i \) (i.e., \( r > i \)).

6. **Direction of Bending**:
- As the ray of light moves from a denser medium to a less dense medium, it bends away from the normal. This is because the speed of light increases as it enters the less dense medium.

7. **Conclusion**:
- Therefore, when a ray of light passes from an optically more dense medium to a less dense medium, it bends away from the normal.

### Final Answer:
When a ray of light passes from an optically more dense medium to a less dense medium, it bends away from the normal.

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