Question

How does the eye control the amount of light entering into it?

Hint:

The iris adjusts the pupil size to regulate the amount of light entering the eye, protecting it from damage.

Answer 1

The human eye controls the amount of light entering it through the pupil and iris.
1. Role of the Iris:
- The iris is a muscular structure that regulates the size of the pupil.
- In bright light, the iris contracts, making the pupil smaller to reduce light entry.
- In dim light, the iris expands, making the pupil larger to allow more light.
2. Automatic Adjustment:
- This automatic adjustment of the pupil size is called the pupillary reflex.
- It helps protect the retina from excessive brightness and ensures clear vision in different lighting conditions.