A ray of light bends .............. the normal when it travels from optically rarer medium to an optically denser medium .

Options

A. away
B. towards
C. far away
D. very close

Explanation

To solve the question "A ray of light bends .............. the normal when it travels from an optically rarer medium to an optically denser medium," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Mediums**:
- Identify the two types of mediums involved: optically rarer and optically denser.
- An optically rarer medium has a lower refractive index (n1), while an optically denser medium has a higher refractive index (n2).

2. **Applying Snell's Law**:
- Snell’s Law states that n1 * sin(i) = n2 * sin(r), where:
- i = angle of incidence (the angle at which the light hits the boundary),
- r = angle of refraction (the angle at which the light travels in the denser medium).

3. **Analyzing the Relationship**:
- Since n2 > n1 (because n2 is denser), we can rearrange Snell's Law to find the relationship between the angles:
- n1/n2 = sin(r)/sin(i).
- Given that n1 < n2, the ratio n1/n2 is less than 1.

4. **Understanding the Angles**:
- Since n1/n2 < 1, it follows that sin(r)/sin(i) < 1.
- This implies that sin(r) < sin(i), which means that angle r must be less than angle i (r < i).

5. **Conclusion**:
- When the angle of refraction (r) is less than the angle of incidence (i), the ray of light bends towards the normal line (the imaginary line perpendicular to the boundary between the two mediums).
- Therefore, the correct answer to the question is: "A ray of light bends **towards** the normal when it travels from an optically rarer medium to an optically denser medium."

### Final Answer:
A ray of light bends **towards** the normal when it travels from an optically rarer medium to an optically denser medium.

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