Why is it difficult to differentiate between red and green colour objects in dark or in night ?

Options

A. Rods work well only during daytime
B. Cones work well only during daytime
C. Rods work well only during night time
D. Cones work well only during night time

Explanation

### Step-by-Step Solution:

1. **Understanding the Eye Structure**: The human eye has a layer called the retina, which is the innermost layer. This layer is crucial for vision as it contains photoreceptors.

2. **Types of Photoreceptors**: There are two types of photoreceptors in the retina:
- **Rod Cells**: These are responsible for vision in dim light conditions (scotopic vision).
- **Cone Cells**: These are responsible for color vision and function well in bright light conditions (photopic vision).

3. **Function of Rod Cells**: Rod cells are highly sensitive to light and allow us to see in low-light conditions, such as at night. However, they do not detect color.

4. **Function of Cone Cells**: Cone cells require bright light to function and are responsible for our ability to perceive colors. They are inactive in dim light, which means they cannot help us differentiate colors when it is dark.

5. **Difficulty in Color Differentiation**: In dark or low-light conditions, rod cells are active, but since they do not detect color, it becomes challenging to differentiate between colors like red and green. This is why it is difficult to distinguish between red and green objects at night.

6. **Conclusion**: The primary reason for the difficulty in differentiating between red and green color objects in the dark is that cone cells, which are responsible for color vision, do not function in low light. Therefore, we rely on rod cells, which do not provide color information.