Near and far points of a human eye are

Options

A. 0 and 25 cm
B. 0 and `oo`
C. 25 cm and 100 cm
D. 25 cm and `oo`

Answer

To solve the question regarding the near and far points of a human eye, we will follow these steps:

### Step 1: Define the Terms
- **Far Point**: This is the farthest distance at which the human eye can see an object clearly without any strain or discomfort.
- **Near Point**: This is the closest distance at which the human eye can see an object clearly without any strain or discomfort.

### Step 2: Identify the Values for a Healthy Eye
- For a young and healthy adult:
- The **far point** is typically at infinity. This means that objects at a very large distance can be seen clearly.
- The **near point** is generally accepted to be about 25 cm. This is the minimum distance at which an object can be seen clearly.

### Step 3: Conclusion
Based on the definitions and the standard values for a healthy human eye:
- The far point is at infinity.
- The near point is at 25 cm.

Thus, the answer to the question is:
- **Near Point**: 25 cm
- **Far Point**: Infinity