The reason why pupils are black, or anything else for that matter, can seem a little counter intuitive. Here is my explanation anyhow.
Imagine everything in the entire universe, from the smallest particle to the biggest galaxy, as alive. With wishes and desires you like you.
Vision is only possible with the help of electromagnetic waves(EMW), they are everywhere, they are that which creates what we describe as the three dimensions of space, time and they that which creates what we describes as 'heat' and makes it possible for our body to be 37 degrees...no electromagnetic waves, no space, time or warm bodies.
Don't worry however, electromagnetic waves "know nothing better" than being everywhere and make things happen, and if each wave could choose and have it it's way, it would span the entire universe.
However, each wave has to compete with the other waves, they want to span the universe to, and thes bigger a wave gets.... thes more space it occupy, thes more vulnerable it gets towards other waves.
In a way like, it is easier to keep an eye on 1 kid than on 2 kids,
so is it easier for the wave, to keep and eye on a little piece of space than on a big piece of space.
First to make vision possible we need to make, the electromagnetic waves want to go into our eyes...(eyes are like homes for EMW's), we can do this by making a overpressure of electromagnetic waves, this is what the Sun does in the day or inside our homes it is done by light bulbs, etc.
So The reason why your pupils look black when you look at them in the mirror, is because that which makes your vision possible, electromagnetic waves, prefer to be inside your eyes.
The reason why night is darker, and colder, is because in the night, very few EMW comes from the Sun to make this overpressure, the night is like an empty restaurant for EMW, you could say.
In the night more EMW's prefer to leave the body to have fun in the atmosphere, this creates this feeling of cold because it is the electrons that make the heat in your body.
And the reason why the night is darker, is because your eyes seem less appealing to the EMW's compared to the atmosphere, so to persuade the EMW's to enter your eyes, you need a little more, this is done by making your pupils a little bigger, like saying, come here kitty kitty.
The reason why black objects often are warmer is also because of this, things that EMW's prefer to be in appear more black, and because EMW's are the same as heat, black objects are often warmer to touch.
No, it's not possible. If it looks like someone does have black pupils, it's probably dark brown pupils.
The answer above is infact incorrect, the iris is the coloured part of the eye, and the pupil is actually just like a tunnel that is in the middle of the iris that allows the light through.
SO THE PERSON THAT SAID THE ABOVE ANSWER IS INCORRECT
The pupil of the eye appears black because most of the light entering the pupil is absorbed by the tissues within the eye.
The pupil actually hasn't got a color at all, it's a hole that opens up into the eye. It only looks black the same way a keyhole or any other opening into an unlit cavity looks black.
The pupil is the central transparent area (showing black) and it appears black because most of the light entering the pupil is absorbed by the tissues within the eye.
Pupil is not an organ..its a small hole ,middle of iris...so inside it there is darkness and we doubt pupil is black.
The pupil is the black center part of the eye.
The pupil is the black center part of the eye.
The black coloring in your eye is the pupil.
Your pupil.
The black part of your eye is known as the pupil.
The black part of your eye is called the pupil.
black center part of the eye
the black pupil
The thing that is green and black in your eye is called your pupil.
The sclerotic is the white part of the eye. The iris is your eye color. The pupil is the black dot.
The centre of the eye is called a pupil (the black spot). The coloured part of your eye is called the iris. You can get green, blue, sea green, blue-green, brown, hazel, dark brown and purple irises. Purple is most rare.
The black circle in the middle of the iris in your eye is called a pupil. It dilates to adjust with sunlight.