science
Grade6
Easy
Question
The iris ___ in bright light and ___ in dim light.
- Contracts, relaxes
- Relaxes, expands
- Relaxes, contracts
- Expands, relaxes
Hint:
We need to concentrate more in low light to look at the objects and vice versa.
The correct answer is: Relaxes, contracts
- The colored area around the pupil, called the iris, regulates the size of the pupil. Its main function is to regulate the amount of light entering the eye.
- In low light, the pupil dilates (opens wider), letting in more light. When you switch to bright light, your pupil automatically contracts.
- When an intense light beam hits the eye, the iris constricts the pupil, protecting the retina and helping it better process incoming images.
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