Yes. In fact, photons are the only things that humans can directly see. A photon is a bit of light.
Human eye lens are convex in nature and form real and inverted images and when the object is kept before the focus point and the centre of the lens it form virtual and erect images.
And people have definitely detected photons in experiments. Not always. The photon has an E=hf or E=hc/λ wave nature. Think of detecting a photon as something like detecting a wobbling jelly with a big stick.
As the image sent to the eye by way of the lens increases, you see an object more easily, even though its physical size has not changed. Experts believe that the naked eye — a normal eye with regular vision and unaided by any other tools — can see objects as small as about 0.1 millimeters.
The human eye can only see visible light, but light comes in many other "colors"—radio, infrared, ultraviolet, X-ray, and gamma-ray—that are invisible to the naked eye. On one end of the spectrum there is infrared light, which, while too red for humans to see, is all around us and even emitted from our bodies.
That's because, even though those colors exist, you've probably never seen them. Red-green and yellow-blue are the so-called "forbidden colors." Composed of pairs of hues whose light frequencies automatically cancel each other out in the human eye, they're supposed to be impossible to see simultaneously.
In fact, we are only able to see visible light, which is a “tiny, tiny fraction of the electromagnetic (EM) spectrum”. He explained that humans can only see around 0.00035 per cent of reality.
Therefore, the colours 'blueish-yellow' and 'greenish-red' are the alleged “impossible” colours that we can't see.
You can see for miles and miles. On a clear day, you can see for up to 3 miles before the horizon due to the curvature of the earth. Yet you can see skyscrapers in a further distance than 3 miles due to no horizon obstruction. If you look into the sky you can see stars during the night that are millions of miles away.
The photons, which one can think of as little discrete packets of energy that travel through space as waves, are absorbed by the retinas in your eyes and the resulting 'information' is then sent to your brain where it is processed and interpreted.
As long as nothing absorbs it, the light keeps on traveling forever.
Yet despite this incredible journey, the photon itself experiences none of what we know as time: it simply is emitted and then instantaneously is absorbed, experiencing the entirety of its travels through space in literally no time. Given everything that we know, a photon never ages in any way at all.
When light hits the retina (a light-sensitive layer of tissue at the back of the eye), special cells called photoreceptors turn the light into electrical signals. These electrical signals travel from the retina through the optic nerve to the brain. Then the brain turns the signals into the images you see.
We cannot see our own face directly, but we can see it reflected in a mirror. Because of its autoscopic function, the mirror has fascinated human beings for centuries (Pendergrast, 2009).
How many eye colors are there, and why your shade is unique to you. At some point, you've probably wondered what the rarest eye color is. The answer is green, according to the American Academy of Ophthalmology (AAO). Only about 2 percent of the world's population sport this shade.
Researchers have long regarded color opponency to be hardwired in the brain, completely forbidding perception of reddish green or yellowish blue. Under special circumstances, though, people can see the “forbidden” colors, suggesting that color opponency in the brain has a softwired stage that can be disabled.
(Source: BBC News.) In traditional funerals in Japan, red was forbidden because it is “a celebratory color.” (Source: Pikatto.) Similarly, in China red was forbidden during periods of mourning. (Source: Beverley Jackson, Splendid Slippers.)
While we can see 100% of the visible spectrum – not 1% – we see very little of the total electromagnetic spectrum. And that share is even less than 1%.
In A Nutshell, Our Brain Models The World for Us
Through something as simple as looking around, our brain – almost like magic – uses our past experiences and connects them with our current situation to construct our reality as we know it.
It is argued by many scientists that bits of information (or qubits) are a more fundamental building block of reality than quarks and electrons. Although a qubit is not a physical object, it contains information about the physical object.
So, What Are the Hardest Colors To See? The short answer is Red. The red color is the hardest to see in the darkness. The cones recognize the color and send a message to our brain.
Researchers discovered the ancient pink pigments in 1.1-billion-year-old rocks deep beneath the Sahara Desert in the Taoudeni Basin of Mauritania, West Africa, making them the oldest colors in the geological record.