Science, asked by sakshi7547, 5 months ago

Give the functions of the following parts of human eye: (a) Eye lens ​

Answers

Answered by ItzMissDevil
5

Answer:

Functions of the parts of human eye:

(i) Cornea. The front part of the eye is called cornea. Most of the refraction for the light rays entering the eye occurs at the surface of the cornea.

(ii) Iris- This is a flat, colored, ring-shaped membrane behind the cornea. It controls the size of the pupil.

(iii) Crystalline lens- Eye lens is a convex lens which focuses the image of the on the retina.

(iv) Ciliary muscles- Ciliary muscles hold the eye lens and changes the this eye-lens while focusing. When these muscles are relaxed the lens becomes thin. Thus, its focal length increases. This enables us to see distant objects clearly. While looking at the closer objects these muscles contract. This increases the curvature of the eye lens, it becomes thick. With this focal length decreases and we see nearby objects clearly.

The pupil, or black dot at the centre of the eye, is an opening through which light can enter the eye.

The sclera, or white part of the eye, protects the eyeball.

Answered by Anonymous
2

Answer:

The lens is located in the eye. By changing its shape, the lens changes the focal distance of the eye.It also works together with the cornea to refract, or bend, light.

The lens is of ellipsoid, biconvex shape. An ellipsoid is similar to a sphere but stretched out, like an olive, and biconvex means it’s rounded outward on both sides. The lens is about 10 mm across and 4 mm from front to back although its shape and size varies as it changes its focus.

The lens consists of the lens capsule, the lens epithelium, and the lens fibers. The lens capsule is the smooth, transparent outermost layer of the lens, while the lens fibers are long, thin, transparent cells that form the bulk of the lens.

Explanation:

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