Is there anything you can see in your eyes? 80

You can see the sadness in your eyes. But to come out of it, what's the big deal that makes you sad like this. There is nothing more important in a person's life than health, and often sadness can easily lead to depression and illness, so you have to think about it yourself.

As the saying goes, the eyes are the windows of the soul, from which a person's good and evil can be seen, experiences.

My feelings were, sad, hopeless, helpless, and exhausted.

From the eyes, you can see sadness, despair, and pain.

Despair, silent crying. Even those who live on earth still look to heaven!!

I magnified her and saw the phone, I'm a girl, I understand that it's happy, and when a girl is really sad, her eyes are red, and then she may still have a runny nose and saliva, this is me, maybe other girls are not the same o

I can only see that you are holding back a smile, and you have specially splashed water in order to pretend. When you cry until your face is full of tears, the white part of your eyes is basically red, your color is too light to achieve the effect of **, but seriously, you are still very powerful, it made me think for nearly three minutes.

There is no joy in sorrow!

This city is so empty, and this memory is so painful

That must be a joy ...

The eye projects light into the light-sensitive retina, where it is received and converted into signals that are transmitted to the brain through the optic nerve. Usually the eye is spherical, filled with a clear, gel-like substance, with a lens for focusing, and usually an iris that controls how much light enters the eye.

The eye is the most important organ of the human senses, and about 80% of the knowledge in the brain is acquired through the eye. Some things such as reading and reading, reading and appreciating pictures, looking at people, and enjoying beautiful scenery all need to use the eyes. The eye can distinguish between different colors and the brightness of light, and convert this information into nerve signals that are transmitted to the brain.

The eye is a very important visual organ, and the human eye is composed of eyeballs, eyelids, eyelashes, lacrimal glands and other auxiliary organs.

The eyeball grows in the eye socket, is round, and has a very complex structure. The eyeball is made up of a clear cornea, iris, pupil, lens, retina, and optic nerve. The cornea is located at the front of the eyeball and helps with focusing.

The iris is brownish-black, grows behind the cornea, is circular, and can be contracted and magnified to control how much light enters the eye. There is a small oval hole in the middle of the iris, called the pupil, which is what we often call the "black eyeball", and it is from this pupil that light enters our eyes.

The transparent lens is located behind the iris and looks like a convex lens that can be used to focus. The retina is one of the most important structures that the eye can see because of its light sensitivity.

When we look at something, the light from the object passes through the cornea and pupil and enters the eye, where it is focused by the lens and forms a clear inverted image on the retina. The optic nerve on the retina then transmits the image to the brain. Our brains can correct the upside-down image and see things.

The human retina is an inverted and reduced real image, while the vision is upright, which is the visual characteristic of the person. Note that it is not upright and so large. Visual imaging is the refraction of the reflected light from an object on the retina through the lens.

It is then transmitted to the brain by the optic nerve so that the person sees the object.

When the distance between the object and the convex lens is greater than the focal length of the lens, the object becomes an inverted image, and when the object approaches the lens from a distance, the image gradually becomes larger, and the distance from the image to the lens also gradually increases (the principle of the projector); When the distance between the object and the lens is less than the focal length, the object becomes an enlarged image, which is not the convergence point of the actual refracted rays, but the intersection point of their reverse extension lines, which cannot be received by the light screen, and is a virtual image. It can be compared with the virtual image made by a flat mirror (it cannot be received by the light screen, but can only be seen with the eye).

1) One of the conditions that need to be met for a convex lens to form a real image is (u>f).

2) Conjugate imaging refers to the fact that the size of object distance and image distance can be interchanged, and in the two cases, they are respectively magnified and reduced.

When looking at a clock outside of the double focal length through a convex lens, the image of the second hand still rotates clockwise, because it is an inverted real image at this time, and it is still in the normal direction when viewed backwards, so it still rotates clockwise.

Retinal imaging is similar to convex lens imaging.

The lens is a convex lens with variable focal length, and the retina is equivalent to a light screen that can be connected to the image.

Visual imaging is the refraction of the reflected light from an object on the retina through the lens. It is then transmitted to the brain by the optic nerve perception! In this way, the person sees the object. For a normal person's eye, the lens thins when the object is far away from the eye, and thickens when the object is close to the eye.

Myopia, on the other hand, is due to the enlargement of the lens of the person, which has a strong ability to refract light, and can only see near objects clearly.

Farsightedness is due to the thin edge of the human lens and the weak ability to refract light, so it can only see distant objects.

When external objects are transmitted to the retina of the fundus through the refractive medium of the human eye, the retina will transmit signals through the optic nerve to the visual center of the human brain, so that the external things are presented in the brain, this is the process of seeing things with the eyes, and the eyes are the windows of the soul, so we should also pay attention to eye hygiene.

Hello, the outside light needs to pass through the cornea to enter the eye, through the aqueous humor, to reach the lens, and after passing through the vitreous, the light can reach our retina. The retina transmits light signals layer by layer into electrical signals, which reach the optic nerve and eventually pass on to the brain, where we can see the beautiful world after complex processing and analysis. Hope it helps.

It's a pity to continue the science with the wrong ones.

The reason why the human eye can see all kinds of things is because when the object is irradiated by light, it can reflect the light in all directions, and these reflected light reaches the eye, and the eye can see things through its unique function. If you can't see your fingers in the dark night, without the reflection of light, your eyes can't see.

Interestingly, not only can the human eye and many creatures in nature sense light, but some metals also have this ability to sense light. This metal emits electrons when exposed to light. The stronger the light, the more electrons are ejected.

Electrons flow in a conductor to form an electrical signal. This phenomenon is called the "photoelectric effect".