The colored part of the eye that controls the amount of light entering the eye.

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Explore Alberta's Grade 8 Science curriculum on Light and Optical Systems. Test your knowledge with engaging quizzes including flashcards and multiple choice questions. Prepare effectively for your exam!

Multiple Choice

The colored part of the eye that controls the amount of light entering the eye.

Explanation:
The amount of light entering the eye is controlled by the iris, the colored ring around the pupil. It contains muscles that adjust the size of the pupil—the opening light passes through. In bright light, the iris contracts to make the pupil smaller, limiting light; in dim light, it relaxes to enlarge the pupil and let more light in. The pupil itself is just the hole light goes through, while the retina is the light-sensitive layer at the back of the eye that detects light, and the cornea is the clear front surface that helps focus light.

The amount of light entering the eye is controlled by the iris, the colored ring around the pupil. It contains muscles that adjust the size of the pupil—the opening light passes through. In bright light, the iris contracts to make the pupil smaller, limiting light; in dim light, it relaxes to enlarge the pupil and let more light in. The pupil itself is just the hole light goes through, while the retina is the light-sensitive layer at the back of the eye that detects light, and the cornea is the clear front surface that helps focus light.

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