Questions tagged [visible-light]

Questions related to the perception and measurement of light (primarily in the visible range), its mathematical description, the reproduction of colors by different means, color combinations, etc. Please use the tag [electromagnetic-radiation] if you want to refer to the general form of light.

Filter by
Sorted by
Tagged with
0
votes
3answers
32 views

Would fast oscillating charged object emit light?

If I were able to mechanically oscillate an electrically charged object at frequencies of 430-580 THz, would the object emit light?
0
votes
3answers
54 views

How far can light (packets of photons) travel on earth or atmosphere?

How far can light travel on earth or in the atmosphere? Or, if I want to be more specific, how far can one photon travel until it disintegrates? I assume gravitational pull and other effects cause ...
-3
votes
0answers
30 views

Is light a particle or a wave? [duplicate]

Wave-particle duality of light is often regarded as a controversial fact. But, according to Quantum mechanics light exist behave both like a wave and a particle. How does this happen?
1
vote
2answers
72 views

Why does violet light bend the most? [duplicate]

When white light passes through a prism, refraction occurs and it splits into its seven constituent colours. If the spectrum is obtained on a screen violet light appears much more bent than red light. ...
0
votes
4answers
105 views

Line of vision - If I cannot see someone, is it possible that they can see me?

Imagine I'm on a rooftop of a building. If I am lying down behind a wall and cannot see someone standing on another building- no matter which direction I look, is it possible that they can see me?
0
votes
0answers
41 views

Does light travelling tangent x distance away from a star fall at the same rate at the same distance away from the star? If not why not? [on hold]

For example if you have a star who's gravity causes a mass to fall at 100ms/ms at a distance of 1 million kilometers, will a beam of light travelling tangent to the direction of the star at 1 million ...
-2
votes
0answers
19 views

Is light in a superposition to become either or electric or magnetic? [on hold]

Photon splits becomes wavelight becomes ,light becomes wave infin
1
vote
0answers
29 views

Possibility of Star Wars style holograms [closed]

We’ve all probably seen those neat little hologram projectors in franchises like Star Wars, are holograms on the level we see them in Star Wars possible? If so, what are some approaches to this type ...
0
votes
1answer
21 views

Can iridescence be produced with a monochromatic light source?

An iridescent substance appears to change color based upon the angle of observation, and I assume this is because the substance reflects different frequencies of light at different angles. My ...
1
vote
3answers
105 views

COSMIC ACCELERATION

Please forgive a probably naïve question from a lay person. I understand that galaxies are all moving away from us in every direction we look. And for any given distance the speed is the same. And ...
-1
votes
1answer
46 views

What do we really mean by the word “light”? [closed]

Does the term "light" refer to any electromagnetic wave or just the visible spectrum?
0
votes
2answers
28 views

Angles of Refraction,Internal reflection and incidence

First ill ask my question in brief and then ill elaborate it below... Theoretically is it that internal reflection occurs within a solid sphere(which is considered to be the denser medium) if and ...
0
votes
2answers
31 views

What do you see when you are inside a transparent conducting material?

Lets say that there exists a transparent conducting material. Lets carve a cavity in the meat of the conductor big enough for a person to stay in. There exists an external electric field. But, We ...
1
vote
2answers
100 views

Are all the photons we observe from the sun disappearing beyond the horizon only reflected ones?

On a boat in the ocean at the equator (earth rotating 28km) watching the sun dip below the horizon (4.7k away) do we see any photons that were emitted directly from the sun (8 minutes ago) or are they ...
2
votes
4answers
240 views

Is it possible to see individual photons impressioning film?

As part of a course in physics teaching, I am developing a small curriculum that will teach (the basics of) quantum mechanics to high school students. I need a simple way to show the quantization of ...
1
vote
1answer
32 views

Will 2 polarizing filters at 90° with the distance of the wavelength of the light between them let it through?

So what I have been taught is, that if you have a polarizing filter which is just 1 vertical slit, you will only get light which is travelling at that angle, turning a 3-dimensional beam of light into ...
0
votes
1answer
46 views

Does light have magnetic poles? [closed]

If visible light is electromagnetic field of certain wavelength does it form closed loops?
0
votes
0answers
16 views

How the field profile is in a diagonal end of the optical fiber?

I would like to know how is the propogation of the beam, let's say Gaussian beam profile, in the end of the fiber? Does it go in shift to the lower side? Does it change its shape? And how the near ...
-1
votes
1answer
57 views

Why sky is blue? [closed]

The major factor of different scattering is the ratio of wavelength to the size of particles which are working as microscopic scattering mirrors. In a sparse particle medium like air, the longer the ...
0
votes
2answers
84 views

Can humans be harmed by visible light? [closed]

It is known that high exposure to radio waves, microwaves, ultraviolet, x-ray, and gamma ray can all negatively affect you. I wonder if being exposed to visible light all the time can have a negative ...
1
vote
0answers
54 views

Gravitational lensing in the form of optical equation $\frac{1}{p} + \frac{1}{q} = \frac{1}{f}$? [duplicate]

Gravitational lensing and light deviation is a well known subject in General Relativity. I'm wondering if the null geodesics equation could be recast into the classical lenses equation: \begin{...
0
votes
1answer
17 views

Calculated focus of an asymmetric bi-convex lens

So I've been working on modeling an optical system using ray tracing. I've finally gotten to the point where I am testing things however I've come across something I'm not entirely sure of. I'm ...
1
vote
2answers
74 views

What are the properties of light in the wave/ particle theory that map to properties we physically observe?

When we see two beams of light of different colours, what is different about them in the wave theory? And what is different about the photons that make up each of them? When we see two beams of light,...
1
vote
1answer
40 views

Is it possible to make a fluorescent material that only glows in response to a specific UV wavelength?

There are any number of fluorescent materials that glow when exposed to UV light. But what if I wanted such a material that only glows in response to very specific wavelengths, emitting no visible ...
0
votes
1answer
36 views

Why doesnt small optical point source cover whole retina?

This is really noob question, I was thinking about how eye works and I dont understand this most basic thing. Imagine a human looking at tiny omnidirectional source of light, like a small LED diode. ...
0
votes
0answers
29 views

Can we determine the color of metal from the basic principle of quantum mechanics?

Is there any method by which we determine the color of metal, such as starting from the basic principle of quantum mechanics?
0
votes
2answers
52 views

Gathering energy from an object that casts no shadow [closed]

In various books, movies, video games, etc., a common element that appears is an object that does not cast a shadow. Usually this lack of a shadow is meant to portray that the object is creepy or ...
0
votes
2answers
119 views

How far can radio waves travel in vacuum? and light waves?

Radio wave and light wave are the same thing. They all are electromagnetic radiation, the only difference between them is frequency. My question : 1, is there any photon-like thing for radio wave? 2, ...
0
votes
2answers
52 views

What will happen if I will beam a ray of light in dark vaccum? [duplicate]

My question is this what will happen if I will flash a beam of light just say in an dark area where nothing is present ( vaccum ) there to reflect light. Just say I am standing and someone flashed a ...
1
vote
2answers
54 views

Black spot when switching intensity of light

Whenever I look at a bright light source and then turn my eyes away I see a large black dot blocking a part of my vision. Does this has something to do with Physics as it involves light or it is ...
11
votes
4answers
3k views

Can two or more lightbeams (from a laser for example) have visible interference when they cross in mid-air*?

I am wondering if two or more specific (in terms of frequency, wavelength etc) light sources could exist and capable of transmitting visible or invisible 'light', and where the beams intersect each ...
1
vote
0answers
26 views

Total amount of diffusely reflected light off of a sphere?

I have a numerical simulation that uses ray tracing to calculate the total amount of light picked up by a sensor, after diffusely reflecting off of an object. To validate this simulation, I'd like to ...
3
votes
3answers
72 views

How is light as electromagnetic waves produced?

One of the upvoted answers to Why don't electromagnetic waves require a medium? says that the electromagnetic field is the medium for electromagnetic waves. It went on to say that if the ...
8
votes
2answers
139 views

Why does the additive color model use red, green and blue instead of yellow, green and violet?

Long cone cells in the human eye are most sensitive to 570-nm wavelengths which are more like spectral "yellow" than spectral "red" and short cone cells are more to 440-nm wavelengths which are more ...
2
votes
0answers
19 views

How are the matrices for the RGB to/from CIE XYZ conversions generated?

So far, I've seen two different sets matrices for RGB ⇄ CIE XYZ. One from the Rochester Institute of Technology: $$ \begin{align} \begin{bmatrix} X \\ Y \\ Z \end{bmatrix} &= \begin{bmatrix} 0....
16
votes
4answers
2k views

Reverse of diffraction

Can we arrange a practical in such a way that the dark and bright bands in diffraction grating be allowed to pass through the same slit to get the original light (i.e the incident light before ...
0
votes
0answers
23 views

Why cant a wire emit light if we apply high enough electric frequency to it? [duplicate]

From my understanding of physics radio and light is the same but with different frequency. Why then there is no lightsource yet made of just a wire and high frequency generator?
1
vote
0answers
21 views

Proof for shapes of fringes on complete screen

I recently studied about fringe patterns due to interference and we learnt to calculate position of Central Maxima etc. At the end of a reference book I saw that the shape of fringes on a complete ...
0
votes
1answer
32 views

Color dispersion at the edge of a slanted mirror

When I look at the edge of a slanted mirror it looks like its affected by color dispersion which you can see by Image 1 but, when it reflects off the flat part of the mirror it looks normal, Image 2. ...
7
votes
4answers
152 views

Why were pulsars not discovered in the visual spectrum?

In 1967, the first pulsar was discovered at a radio observatory in Cambridge. Radio astronomy started around the 1930s, but astronomy in the visible part of the spectrum had been done for a long time ...
1
vote
1answer
21 views

Difference between 'white light' and spectral light for rings of Newton

In my book of waves and optics, there's a chapter about the rings of Newton and as a question there is: how is the interference pattern when we use white light, considering me it's : there are rings ...
2
votes
3answers
128 views

What frequency is pink color?

There has not been an attempt to answer the first part of the question (the part in italic) therefore here is a link to the question in biology stackexchange: https://biology.stackexchange.com/...
0
votes
2answers
57 views

Reason for change in colour of light

We all know that light has constant speed, and variable wavelength, and frequency. Suppose I have a big red glass square sheet. When white sun rays pass through it, their colour changes from white to ...
12
votes
1answer
2k views

Is the specular reflection on a polished gold sphere white or gold in colour?

My understanding is that all specular reflection is due to Fresnel reflection at the interface which is a broadband effect. A classic example might be a white reflection on a polished ball (e.g. ...
0
votes
0answers
27 views

How I can add lenses stacked on front of iphone camera to increase magnifying power?

How we can stack different lenses to increase magnifiying power of a smartphone camera? Is there any way to test if stacked lenses will focus light on image sensor of smartphone exactly right before ...
1
vote
2answers
29 views

Why texture of an object depends on the amount of light it reflects?

The darker an object, the less visible is it's texture: texture of blackboard is visible because it reflects 7% of light; texture of an asphalt road is visible because it reflects 4% of light; an ...
2
votes
1answer
74 views

Do photons “bounce off” of electrons?

I’ve been reading a book, and in one part the author explains how electrons only absorb the wavelengths of light that can take them to an excited state, i.e. that can take the electrons to a higher ...
1
vote
0answers
25 views

Detecting how bright is the sun using a photodiode [closed]

Basically I'm trying to control the moment when I turn on the lights using a photodiode. Let's say when the sun illuminance is 10lx, the photodiode will read a given value in $\frac{W}{cm^2}$. Given ...
1
vote
1answer
36 views

Why are gold nanoparticles red?

While watching the latest computerphile video (https://www.youtube.com/watch?v=FGiBHsUkVzU) I came across a solution of nanoparticles of gold , but to my surprise, they appeared as red, shouldn't ...
1
vote
0answers
22 views

Viewing with hand above eyes

Some pictures of American Indians show them with a flat hand above their eyes. It seems like I heard that is because they could get a slightly sharper view of the horizon rather than just shading ...