the amount of light entering the human eye is controlled by Related: Human Eye Colourful World - MCQ, Science, Class 10?

Question

the amount of light entering the human eye is controlled by Related:  Human Eye Colourful World - MCQ, Science, Class 10?

Answer

The amount of light entering into eye is controlled by varying the size of pupil.

Samjhe .. ya Samjhau..

Answer

The amount of light entering into the eye is controlled by iris .

The iris opens and closes to

control the amount of light entering

the

eye

through the pupil

Answer

The amount of light entering the human eye is controlled by the pupil and the iris. The pupil is the circular opening in the center of the iris through which light enters the eye. The iris is the colored part of the eye surrounding the pupil.

Pupil:
The size of the pupil can change to regulate the amount of light entering the eye. This adjustment is known as pupillary reflex or pupillary response. The muscles in the iris, known as the sphincter pupillae and dilator pupillae, control the size of the pupil.

Constriction:
When there is excessive light or when focusing on nearby objects, the muscles in the iris contract, causing the pupil to constrict or become smaller. This limits the amount of light entering the eye and prevents the image from being too bright or washed out.

Dilation:
In low light conditions or when focusing on distant objects, the muscles in the iris relax, allowing the pupil to dilate or become larger. This allows more light to enter the eye, making it easier to see in dim lighting conditions.

Adaptation:
The human eye also has a mechanism called adaptation, which helps adjust to changes in lighting conditions. It takes some time for the eyes to adjust from bright light to darkness and vice versa. In bright light, the iris contracts to reduce the pupil size and limit the amount of light entering the eye. In darkness, the iris relaxes, allowing the pupil to dilate and capture more available light.

Role of Pigments:
The pigments present in the iris also play a role in controlling the amount of light entering the eye. The color of the iris, which determines eye color, is due to the presence and concentration of pigments like melanin. These pigments absorb or reflect certain wavelengths of light, affecting the overall amount of light entering the eye.

Overall, the pupil size, controlled by the muscles in the iris, along with the pigments present in the iris, help regulate the amount of light entering the human eye. This mechanism ensures that the eye receives an optimal amount of light for clear vision in different lighting conditions.

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