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

Options

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

Answer

**Step-by-Step Solution:**

1. **Understanding the Mediums**:
- Light travels through different mediums, which can be classified based on their optical density. An optically less dense medium has a lower refractive index compared to a more dense medium.

2. **Identifying the Transition**:
- In this scenario, we are considering a ray of light transitioning from an optically less dense medium (like air) to a more dense medium (like glass or water).

3. **Applying Snell's Law**:
- Snell's Law states that when light passes from one medium to another, the ratio of the sine of the angles of incidence and refraction is equal to the ratio of the velocities of light in the two mediums, or equivalently, the inverse ratio of their refractive indices:
\[ \frac{\sin i}{\sin r} = \frac{v_1}{v_2} = \frac{n_2}{n_1} \]
- Here, \( n_1 \) is the refractive index of the less dense medium, and \( n_2 \) is the refractive index of the more dense medium.

4. **Behavior of Light**:
- When light travels from a less dense medium to a more dense medium, it slows down and bends towards the normal line (the imaginary line perpendicular to the surface at the point of incidence).

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

**Final Answer**: The ray of light bends towards the normal when passing from an optically less dense medium to a more dense medium.

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