All Questions
41
questions
1
vote
2
answers
164
views
How do our eyes perceive a parallel beam?
So if our eye is considered a lens, a parallel beam (sort of like collimated light from a flash light) should converge to a single point, the focal point. So does that mean our eye will see a finite ...
- 313
0
votes
1
answer
72
views
Is it possible to design a wheel without the wagon-wheel effect?
Wagon-wheel effect is a well-known optical illusion due to the persistence of vision. It happens when the spoke of a wheel rotates to a certain position after the duration of persistent vision. ...
- 3,701
0
votes
2
answers
100
views
Does intense, cyclically-pulsed light appear brighter than its average?
Background
The Wikipedia article on the Talbot-Plateau law mentions:
If a light flickers so rapidly that it appears as continuous, then its perceived brightness will be determined by the relative ...
- 101
1
vote
1
answer
84
views
Is color perception linear? [duplicate]
I'm learning about the trichromatic theory of color perception. Say a receptor detects a wavelength $\lambda\in\mathbb{R}$ and responds with $f(\lambda) = (r,g,b) \in \mathbb{R}^3$. This system is ...
- 13
0
votes
0
answers
85
views
How does the human eye form an image of a certain size at a certain distance?
In looking at how geometric optics works and how an eye rebuilds an image of a certain size at a certain distance, some questions came to me:
Let's take a look at the first picture for example; the ...
- 941
13
votes
7
answers
5k
views
Are human eyes interferometers?
It seems like 2 eyes is enough “wetware” to do interferometry inside brain. Can you definitely see some reason why this could not be happening, or some way to test if it does happen?
- 605
0
votes
1
answer
199
views
How does curvature of our eye affect our perception of the world? [closed]
The front part of the eye which can allow light to enter is a bit curved, so shouldn't this cause us to see a curved distorted version of reality when it is really not there? Is there any way to ...
- 7,980
0
votes
2
answers
1k
views
Blinking LED and the human eye/perception
When an LED is flashing at 2 times a second, the human eye can perceive the ON and OFF state. We can clearly see when the ON state is and when the OFF state is.
When it is flashing 10,000 times per ...
- 183
1
vote
1
answer
199
views
Why objects dont appear closer and smaller to a myopic person and far and larger to hypermetropic person after wearing spects?
I am a myopic person, and wear a concave lens. It is taught to us that lens I wear help to form image on my far point and thus help me to see far object.
1.But we have also learn that concave lens ...
user313211
34
votes
11
answers
10k
views
Why can't the human eye focus to make blurry photos/video clear?
The human eye focuses by flexing the lens, changing its focal length. When we switch from looking at a near object to a far object, our lens flexes, moving the focal length such that the near object ...
- 880
0
votes
5
answers
912
views
Why does the brain interpret light from a mirror the way it does? [closed]
When we place an object above mirror and viewed from side, we see the image to be below the object, as if the reflected light is coming from inside the mirror.
From the image above, the light from top ...
- 662
-2
votes
1
answer
71
views
Third Eye and how the brain would see the world [closed]
Let's suppose that through engineering, a third bionic eye would be attached to a human and interfaced directly with the brain. Let's assume this third eye is positioned in the middle of the forehead.
...
- 97
2
votes
1
answer
78
views
Why did a green light appear white when looked out of the corner of my eye? [closed]
The other day I saw a green light emitted from some source far away, and I realised that if I looked at it out of the corner of my eye I perceived it completely white. What is the explanation for this?...
- 401
0
votes
1
answer
200
views
Why the color of light observed dark (almost no light) from section of overlapping of two different colored plastic sheets?
Two transparent plastic sheets say of red and blue color overlap as shown in figure . An observer looks at a clear sky through the sheets.
He will observe light coming through sections as,
SECTION 1: ...
- 121
11
votes
5
answers
2k
views
Why does an image seem smaller through a pinhole when viewing with human eye?
I was chewing gum when I took the Trident gum wrapper and rolled it into an open cylinder with a diameter of about 1.5mm (give or take 0.15mm). When I look through the gum wrapper (I have to put it ...
- 127