After looking sun the colour of other things appears:

Options

A. black
B. white
C. yellow
D. red

Explanation

**Step-by-Step Solution:**

1. **Understanding the Effect of Sunlight on the Eyes:**
- When we look directly at the sun, the intense light causes our pupils (the opening in the center of the eye) to constrict or become smaller. This is a protective mechanism to reduce the amount of light entering the eye and to prevent damage.

2. **Transitioning from Bright Light to Dim Light:**
- After looking at the sun, if we suddenly shift our gaze to a darker environment (like when we enter a house), the pupils remain constricted for a short period. This means that less light is entering the eye.

3. **Perception of Colors in Low Light:**
- Due to the constricted pupils, the amount of light available to the retina is significantly reduced. As a result, the brain receives insufficient visual information to perceive colors accurately.

4. **Conclusion:**
- In this low-light condition, everything appears black or very dark because the eyes are not able to adjust quickly enough to the change in light levels. Therefore, after looking at the sun, the color of other things appears black.

**Final Answer:**
After looking at the sun, the color of other things appears **black**.

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