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.

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How to propagate the wavefunction of a photon in single slit diffraction?

During my undergrad, I remember writing a simulation in which the diffraction patterns which emerge from light passing through a single slit were calculated. This was done, basically, by calculating ...
Gregor Hartl Watters's user avatar
1 vote
1 answer
48 views

Why does the energy (and thus frequency) of a photon entering glass stay constant if some is used up to accelerate electrons and slow down the light?

I'm learning optics and have been told that when light enters a medium (e.g. glass) and slows down the frequency of the light stays constant while it is the wavelength which is reduced. The ...
Hadi Khan's user avatar
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2 answers
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Why is a bigger camera sensor better at low light than a smaller one?

People say a bigger camera sensor is better for light performance as the photo sensors are bigger and hence let in more light. But couldn't you just let the same light in and focus it down onto the ...
George kirby's user avatar
-2 votes
0 answers
30 views

Lens in tilted image formation [closed]

Consider a lens and on this lens rays are incident parallel to the principal axis now if the lens is slightly tilted by an angle theta then by how much does the focus shift?
Aryan Jaiswal's user avatar
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28 views

Property of total internal reflection question

If I create a medium with gradually decreasing refractive index from once face at index 2.0 and other at 1.01, and show a beam of light upon the optically denser side, will there be any losses upon ...
Udaiyan Bhan's user avatar
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1 answer
98 views

Can the velocity of an image produced by a plane mirror be greater than that of light?

We are currently studying ray optics in school and it made me wonder if the velocity of an image produced by a plane mirror can theoretically be greater than that of light. Using the relation $v_i = 2 ...
Milkprisonersvostok1's user avatar
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23 views

Why in the experiment of double slits, in case of radiation of wavelength of red light, we can observe an envelop of the minimum?

I have made an experiment in which i have to measure the intensity of the light generated by an $\text{He-Ne}$ laser, in the case of two slits, I pretend to observe an interference lattice. I have to ...
Matteo Saba's user avatar
1 vote
1 answer
15 views

If a star's luminosity doubles, does its received flux double?

If the luminosity of a star increases or decreases in some way, would the received flux increase or decrease by the same amount (linearly) or would it change by the square of the luminosity (inverse ...
Astrovis's user avatar
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Is there a way to calculate the habitable zone distances of a star?

What would you need to calculate the habitable zone distances of a star? I am aware of the Stefan-Boltzmann Law and Wein's Law to calculate the Luminosity of the star, and that the flux decreases with ...
Astrovis's user avatar
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3 votes
1 answer
171 views

Is there a way to determine whether what I see is a source of light, a real image, or a virtual image?

Let's suppose you are in a dark room and see something resembling a firefly. The light it emits is so dim that nothing else is visible. You're told that it's either a real source of light or an image ...
Mitsuko's user avatar
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Is there a way to calculate the angle between the refracted and reflected rays given the refractive index?

Is there a way to calculate the refracted and reflected rays? I know we use Snell's law to calculate the refracted rays, but is there a formula to calculate the angle of the reflected rays, or does it ...
Astrovis's user avatar
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2 votes
0 answers
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Apparent position of object in bowl of water

Say you have a bowl of water and you keep an object in it. What would the apparent position of an object inside the bowl from the position of an outside observer? Will the curvature of the spherical ...
Astrovis's user avatar
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22 views

Any research or study that monitored the spectrum of the natural light during the entire day?

I am interested in understanding the light spectrum during sunrise, morning, midday, afternoon, golden hour, and blue hour. Is there anyplace I can look at those?
Alessandro Carrese's user avatar
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1 answer
51 views

If a silver screen works for a movie projector then why not a mirror?

I have a projector and use a white sheet, thumb tacked, and stretched over a wall. It works fine. I went to the movie theater and looked at their screen closely. It was a fine silvery white glitter-...
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2 answers
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Light from an eclipse [closed]

Why do people fry their eyes staring at the sun during a solar eclipse? Is it that they stare at the sun for a long time---longer than if they stared without an eclipse? Or is it that during the ...
Thad_The_Man's user avatar
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2 answers
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Could another star render color better than the Sun? If so, would a human be able to tell?

Disclaimer: This might be a better question for Worldbuilding SE, not completely sure. I read today that the standard method of measuring color rendering index (CRI) is based on natural light (e.g. ...
Faustawk's user avatar
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2 answers
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What is a laser spectrum?

What is a laser spectrum? How many wavelengths can we see in it, and why? For a regular laser, the red ones you can buy at the store, is there just one red wavelength in the laser? Or are there ...
qris's user avatar
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2 answers
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Will the Intensity of parallel light rays decrease over distance?

As per what I have understood, the inverse square law applies to diverging beams of light. But what about parallel rays in a lossless medium? If its intensity does decrease, how?
Shristeerupa's user avatar
1 vote
1 answer
24 views

What is the emission spectrum of an igniting match?

I took this photo of a burning match just after striking. There are clear emission lines rippling throughout the spectrum and a huge peak in the orange. Nowhere online could I find a lit match ...
jmadden's user avatar
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How can one make a visible light bulb that works through cyclotron radiation?

I figure that I first start with a charged particle accelerator. Let's say we can make this from electromagnets arranged in a circular ring in the XY plane with a magnetic field $B$, perpendicular to ...
QEntanglement's user avatar
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Can pure colors be reflected from a non-light source object?

I wanted to print something in pure cyan and I learned that I can actually not achieve the exact color I was looking for (#00FFFF in RGB for context). I now have this question about these "pure&...
Mitsos YT's user avatar
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0 answers
32 views

What is the speed of light during reflection? [duplicate]

What is the speed of light in a vacuum when the light reflects off of a mirror?
Christina Daniel's user avatar
2 votes
2 answers
72 views

Is reflected photon the same? [duplicate]

When a single photon is reflected is the same one, or is it a new photon (emitted) while the 'original' photon has been absorbed? I'm not sure how to imagine a refleced photon - it's not a ball ...
matej's user avatar
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1 vote
1 answer
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Why do we see objects with a given color?

I'm currently studying Electromagnetic Optics, and I don't quite understand the (classical) process through which we perceive an object with a given color. From my understanding, I'd make a ...
AlanFox86's user avatar
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3 answers
54 views

Why no image is formed when an incident and reflected ray intersect?

When two light rays intersect after reflecting from a concave mirror they form a real image. but what happens if, say, a ray from the head of the object A collide with the reflected ray DA'? It might ...
Ansh Dwivedi's user avatar
3 votes
1 answer
101 views

How is it possible that photons already move at the speed of light the moment they pop into existence? [duplicate]

This is a thought experiment and I might be horribly wrong. If we have an electron-positron annihilation a photon pops into existence. This photon is then supposedly moving at speed of light at the ...
Jurre Groenewegen's user avatar
1 vote
1 answer
80 views

Why do highlights occur on edges? [closed]

When looking at an object, the highlights are usually on the corners and edges. Highlights can occur anywhere on an object, but it seems like the brightest parts are where it is the most sharp.
mh11111's user avatar
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2 answers
87 views

Proof that light has a width [closed]

Now this is my suggestion so please guide me. Take a plane mirror. We know that light reflects from it. This is a case of regular reflection meaning the surface is smooth. But we experience friction ...
MathsGuy's user avatar
1 vote
1 answer
28 views

How to determine the light rays difference according to book by Okamoto?

In the very beginning of the book "Fundamentals of Optical Waveguides" by Okamoto, there is a description of light ray propagation in the waveguide. I provided an updated Figure from it: ...
moryev's user avatar
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1 vote
0 answers
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Isn't Reflection just absorption and emission? [duplicate]

How do mirrors work? How do the atoms in a mirror reflect photons. Does it absorb and reflect? As I understand it, after an atom absorbs a photon it is bound to release that same photon of the same ...
user15755358's user avatar
1 vote
0 answers
13 views

Transition from Coherent to Incoherent Light / Partially coherent Light for Imaging

I want to know how to model partially coherent/incoherent light for imaging applications. Usually, you find mathematical treatments of imaging just for the extreme cases. For the coherent light, there ...
kai90's user avatar
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0 votes
2 answers
44 views

How do I calculate lumens of a specific RGB light source from watts per square meter per steradian?

Context I am trying to understand irradiance calculations for interior lighting in Blender software and got stuck with inputting light strength in lumens, because the lights in the software take watts ...
Martynas Žiemys's user avatar
-1 votes
1 answer
29 views

Why does reflected light not cancel out depending on color?

I have been learning about light reflection and refraction and was thinking about objects reflecting only certain wave-lengths. Why doesn't a red object with a green light shone on it appear black? I ...
Silas Brock's user avatar
0 votes
0 answers
22 views

On dimensions as a concept [duplicate]

really naive question here, i don't know anything about physics, in a professional sense. Light is a electromagnetic wave, and itself requires 3 dimensions to propagate, then how can a one-dimensional ...
Aditya Mishra's user avatar
1 vote
1 answer
106 views

Did Newton know that light has no inertia? [closed]

Newton studied a lot about optics and gravitation. Did he realize to some extent that light is a massless particle? How does his theory explain the bending of light due to a gravitational field?
user74750's user avatar
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0 votes
1 answer
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Is amplitude measured from the electric or magnetic fields of a wave?

When you measure amplitude, does that refer to the electric portion of the electromagnetic field, or does it refer to the magnetic portion? Or is an average of the two? Another question is, are the ...
Astrovis's user avatar
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0 votes
0 answers
25 views

Young's experiment

Does the interposition of the glass slide, which has a refractive index different from that of air, alter the wavelength emitted by the laser? Does this impact young's experiment?
Nicco93's user avatar
-2 votes
1 answer
49 views

Can light propagate in the absence of electric and magnetic fields?

It has been established that light or other forms of electromagnetic radiation needs electric and magnetic fields in order to propagate. What would happen if it were possible to shield an area from ...
Dilip James's user avatar
0 votes
1 answer
31 views

Object and Image Distance from Image height, Object height, and focal length [closed]

Is there a way to find the object and image distances from the object height, image height, and focal length? I understand that the magnification is equal to $-\frac{d_i}{d_o}$ or $\frac{h_i}{h_o}$, ...
Astrovis's user avatar
  • 155
2 votes
1 answer
44 views

Physics behind Lambertian reflectors

Most ordinary surfaces are near Lambertian diffuse reflector, i.e. a small local radiates most strongly at norm then attenuates by cosine law when one gets to the tangentials. However this seems hard ...
Meatball Princess's user avatar
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0 answers
22 views

Why are light rays expressed or generally shown as a sine wave? [duplicate]

Whether it be a YouTube video or book lights rays i.e(the visible specturm,uv rays) are expressed as a sine wave. Why is it so? What is the plot of its against? Why does it oscillate? Why does it ...
Shankar Shrestha's user avatar
0 votes
2 answers
54 views

Black Body radiation and radiation in general [duplicate]

So I'm learning about blackbody radiation and radiation in general. As I understand it, there are 3 ways to transfer energy/heat: Convection, Conduction and Radiation. In chemistry I also learnt about ...
user15755358's user avatar
0 votes
0 answers
20 views

Minimum Radius of Curvature an Optical Fiber can be bent

Using the thickness and refractive index of an optical fiber, is it possible to know the maximum radius of curvature it can be bent before there are losses due to refraction? In my research, I came ...
Astrovis's user avatar
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0 votes
2 answers
60 views

Height of Mirror Required [duplicate]

I was curious about the minimum height of a mirror required to see your full body, and I found out that it was half of your height, in other words the minimum height to view the image = your height / ...
Astrovis's user avatar
  • 155
1 vote
1 answer
21 views

Spectroscopy on colored flames

When observing colored fire through a spectrometer after adding substances like copper chloride or magnesium sulfate to change its color, what specific spectra are typically observed? How does the ...
Rookynote's user avatar
1 vote
2 answers
123 views

Why is the $\cos^2$ envelope much more popular than $\cos^4$ to approximate the shape of a Gaussian laser pulse?

The Gaussian laser pulse $$ E(t) = E_0 e^{\frac{-2\ln 2}{\tau^2} t^2} \cos{\omega t} $$ (where $\tau$ is the intensity FWHM) is often troublesome in numerical simulations due to the infinite temporal ...
Neinstein's user avatar
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5 votes
4 answers
2k views

Aren't places where geodesics end singularities?

So of course when stuff falls into black holes, the geodesic for anything ends in that singularity. However, isn't it technically true that a light ray that originates from the sun and then hits the ...
MiltonTheMeme's user avatar
-1 votes
1 answer
29 views

Can molecules bend light?

As we know, objects with a large gravitational field can bend light, but, my question is, Can molecules bend light? Since molecules have a small amount of gravity, couldn't they bend light in at least ...
Kellan Heerdegen's user avatar
1 vote
0 answers
21 views

Understanding and researching with Spectroscopy

I am very new to physics so don't know a whole lot yet, so please correct any incorrect vocabulary you may find. Papers that are easy for beginners to understand are also very welcome! Context: I am ...
Rookynote's user avatar
0 votes
0 answers
50 views

Could we measure the one-way speed of light with two connected rotating apertures? [duplicate]

Can we measure the one-way speed of light by passing light through angularly shifted apertures in two disks solidly connected and spinning at a known angular velocity? Here is the apparatus I would ...
Hermanek's user avatar

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