Question

ANYONE TELL ME ABOUT HUMAN EYE. WITHOUT USING GOOGLE BRAIN​

Answer 1

the human eye functions much like a digital camera. ... Its job is to convert images into electronic signals and send them to the optic nerve. The optic nerve then transmits these signals to the visual cortex of the brain which creates our sense of

Answer 2

You see, the human eye is like a camera having a lens system forming an inverted, real image on a light sensitive screen inside the eye, called the retina. Light goes inside the eye through a thin membrane, called the cornea, which covers the transparent bulge on the surface of the eyeball. Eyeball is approximately sphere having diameter of about 2.3 cm. The cornea and the aqueous humor act as lens and both provide most of the refraction for the light, which enters in the eye.

The crystalline lens adjusts the focal length required to focus object at different distances at the retina, behind cornea is the iris, which controls the size of the pupil. Iris. an adjust its size, therefore, helps in regulating the light entering through pupil.

The light entering the eye is focussed by the eye lens and forms an inverted, real image of the object on the retina behind the lens. In the relaxed position, the focal length of the eye lens is about 1.7 cm. The eye lens can adjust its focal length and this property is called accommodation. However, the focal length of the eye lens cannot be decreased below a certain minimum limit.

Unlike a camera, the image formed on the retina of the eye is not permanent. Its impression remains on the retina for about (1/16)th of a second, even when the object has been removed. This is called the persistence of vision. A normal eye can accommodate for all distances between infinity (far point) and about 25 cm (near point).

The maximum variation in the power (1/f) of the eye lens that can be achieved by the eye of a person is called its power of accommodation.