Question

Describe about Human Eye.

Answer 1

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Answer:

The eye is probably the most important optical instruments. In principle, an eye can be compared to a $\textbf{photographic camera}$. In a camera, the aperture of the lens had to be adjusted. But the eye can regulate the $\textbf{aperture at its own}$. In a camera, the image of an object is focused on the film by adjusting the distance between the lens and the film. But the eye can $\textbf{sharply focus the images}$ of objects lying at different distances on the retina by changing the focal length of its lens through muscle action.

$\textbf{\underline{Parts\:Of \:The \:Eye}}$:

The human eye is about $\textbf{2.5 cm}$ in diameter and is nearly spherical in shape. It is maintained in this shape by the $\textbf{pressure of the fluid inside it}$.

$\underline{\textbf{Following\: are \:the \:parts \:of \:eye}}$:

1) $\textbf{\underline{Sclerotic}}$: It is a dense, opaque and horny outer covering of the eye ball, part of which is visible as the $\textbf{white of the eye}$. It's function is to $\textbf{protect}$ the eye.

2) $\textbf{\underline{Cornea}}$ : In the front of the eye , the sclerotic merges into a transparent curved tissue, known as $\textbf{cornea}$. The light enters the eye through cornea.

3) $\textbf{\underline{Iris}}$: It is a circular diaphragm behind the cornea. It has a central hole, known as the $\textbf{Pupil}$ of the eye. This iris contain the pigment that determines the $\textbf{colour}$.

4) $\textbf{\underline{Choroid}}$: It is the $\textbf{black}$ coating of the sclerotic saturated with a black pigment and it's function is to absorb the $\textbf{superfluous light}$.

5) $\textbf{\underline{Retina}}$: It is a light sensitive membrane on the back interior wall of the eye ball. It is composed of nerves and two types of light sensitive cells, called $\textbf{rods and cones}$.

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Answer 2

${\textbf{Human Eye}}$

The human eye is an organ that reacts to light in many circumstances. As a conscious sense organ the human eye allows vision; rod and cone cells in the retina allow conscious light perception and vision, including color differentiation and the perception of depth. The human eye can distinguish about 10 million colors.

$\underline{\textbf{ \:The \:parts \:of \:eye}}$

1)$\textbf{\underline{Sclera}}$

➞It is a white visible portion. It is made up of dense connective tissue and protects the inner parts.

2) $\textbf{\underline{Cornea}}$

➞It is the transparent, anterior or front part of our eye, which covers the pupil and the iris. The main function is to refract the light along with the lens.

3)$\textbf{\underline{Iris}}$

➞It is the pigmented, coloured portion of the eye, visible externally. The main function of the iris is to control the diameter of the pupil according to the light source.

4)$\textbf{\underline{Pupil}}$

➞It is the small aperture located in the centre of the Iris. It allows light to enter and focus on the retina.

5) $\textbf{\underline{Retina}}$

➞It is a light sensitive membrane on the back interior wall of the eye ball. It is composed of nerves and two types of light sensitive cells, called rods and cones.