How does the eye adjust to take account of an increase in brightness?

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Humans will close and open their eyes according to the brightness.

Brain gives instruction to do that

By using glasses we can adjust the brightness.

Human eye – Pupil helps to adjust the light .

answer is D.

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Detailed Solution

Concept: The cornea of the eye allows light to enter, which then travels through the pupil and lands on the eye lens. Since the eye lens is a convergent lens—as we all know—it concentrates all light into one spot, creating a genuine and inverted image of the object. Also, the eye's pupil contracts as light increases.
The way the human eye sees the world around it depends on the refraction of light through a naturally occurring convex lens composed of transparent material. The cornea, iris, pupil, ciliary muscles, eye lens, optic nerves, and retina are all components of the human eye.
Human eyes consist of cornea, iris, pupil, ciliary muscles , optic nerves and retina . will help in the function of eyes.
When the brightness increases that time pupil of the eye shrinks and less light will enter the eyes.
Hence, the correct option is 4.

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