When the intensity of light is low during night the light is detected by

Options

A. Lens
B. Rods
C. Cones
D. Both B and C.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which cells in the eye detect light when the intensity is low, such as during the night.

2. **Evaluating the Options**:
- **Option 1: Lens**: The lens is a biconvex structure in the eye that focuses light onto the retina. However, it does not detect light; it only helps in focusing it. Therefore, this option is incorrect.

- **Option 2: Rods**: Rods are photoreceptor cells located in the retina that contain a pigment called rhodopsin. They are specifically adapted for low-light conditions and are responsible for scotopic vision (vision in dim light). This makes this option correct.

- **Option 3: Cones**: Cones are another type of photoreceptor cell that contain pigments such as iodopsin, porphyropsin, and cyanopsin. They are responsible for color vision and function best in bright light conditions. Thus, this option is incorrect.

3. **Conclusion**: Based on the evaluation of the options, the correct answer is that during low light intensity at night, the light is detected by rods.

**Final Answer**: The light is detected by rods.

---