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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75 views

Why do we ignore magnetic field vector during polarization?

Most light sources in nature emit unpolarized light. Natural light sources consist of very large number of randomly oriented atomic emitter, which emit polarized light randomly. A linear polarizer is ...
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1answer
44 views

Can RGB screen color exist in real physical world?

For example the bright royal blue color; R0 G10 B220, HEX: #000ae1. I know this color cannot be printed nor painted. But can this blue color exist in the real world other than on a digital screen? For ...
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Energy of light

If a beam of light is travelling in full vacuum in same medium ,then , the energy of the light beam will decrease or not while moving through space ? The wavelength of the beam of light will change ...
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1answer
41 views

Can a light absorbing bulb-like thing be made?

A bulb emits light. So can a bulb-like thing or anything be made such that it absorbs all/most of the light when turned on? For example, when room is dark we switch on bulb and it spreads light. Let ...
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4answers
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Light propagating through a sound wave

We know that the speed of light depends on the density of the medium it is travelling through. It travels faster through less dense media and slower through more dense media. When we produce sound, a ...
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3answers
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Can this be considered the Newton's rings?

It can be made by pointing a laser pointer directly to a mirror at low angle and observing the reflection behind the laser pointer. No convex or concave lens needed unlike the Newton's ring experiment ...
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3answers
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How does a single photon behave propagating through glass?

Take a normal pane of window glass and a photon somewhere within the visible range. My limited understanding is that when light passes through glass one shouldn't think of little spheres travelling ...
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1answer
88 views

How is reflection of light possible at all? [duplicate]

If a photon cannot be accelerated or decelerated, how is reflecting them possible at all?
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113 views

why aluminium reflect less light than matte white paint?

I'm reading the book: automating hydroponics, from Cerreto Rossouw. He wrote, p46, "you shouldn't use aluminium foil because it's quite poor at reflecting light (...) A practical alternative (...) ...
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1answer
25 views

How can I maximise light in a small, space with minimal visual appearance of apparatus?

I really looking for advice about something I would like to make and methods of gathering/collecting natural light and maximising it's potential in a small enclosed space... My reference it the ...
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1answer
65 views

Light from an incandescent lamp

In a tungsten filament lamp, electrons travel through a high resistance path,due to which the temperature is increased. Now why does it emit light , is it because of the transitions of electrons from ...
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Optics of thick soap bubbles

There was some discussion in a previous thread ( Why are thin soap bubbles colorless? ) that talked about thin soap bubbles. My question is, what if we go the opposite way? Why are thick bubbles ...
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2answers
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If a photon is powerful enough, will it not pass through glass?

So I know how glass works, it has a large electron gap so the photons that hit it don't have enough energy to move the electrons into a high energy state and instead pass through because the amount of ...
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0answers
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Stokes vectors and fractional polarisation

I am struggling to be able to write this problem as a Stoke's vector. I understand how to set it up, but am not sure if you need two separate vectors that you combine or just one. Any help would be ...
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3answers
59 views

Why do we see an object with more clarity if more light rays from it enter our eye?

When I ask people what is the difference between more light rays diverging from a point and entering our eye and less rays diverging from a point and entering our eye.They say that more the light rays,...
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3answers
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Virtual images - Work of a brain or work of a lens?

I am just a high school student trying to self study, so please excuse me if this question sounds silly to you. Many people tell me that virtual images are formed when two rays that are diverging ...
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1answer
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Is it possible to make a source of light such that it only emits one ray of light?

I am just a high school student trying to self study, so please excuse me if you find the question silly. I don't really need to explain my question.I am just asking if we can make a source of light ...
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2answers
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Reflection of a mirror concerning angle and wavelength

Mirror has a silver coating which helps it reflect all colors of light. From my classical understanding, silver atoms reflect light by absorbing it and then emitting it at the same angle to the normal....
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2answers
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Can we see a point with only one ray or do we need two rays?

I am just a high school student trying to self study, so please excuse me if you find the question silly. My teacher says that we can see a point when a ray of light from the point is reflected into ...
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1answer
49 views

Polarization on a spherical electromagnetic wave in free space using classical electromagnetism

The polarization of a plane wave traveling in free space is well defined and traverse to the direction of propagation from classical electromagnetic theory. Spherical waves are another type of ...
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5answers
127 views

Does glass emit ultraviolet light?

I'm fully aware that glass absorbs light in the ultraviolet band. Moreover, glass does not absorb any light which has a longer wavelength than that of the UV light, making it transparent. This ...
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1answer
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Color of Every gas should be white?

The reason why halogens are coloured are because they absorb visible light and their electrons get excited to higher States this result in visibility of the complementary colour But when an electron ...
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2answers
50 views

How to determine the axis of a polaroid?

I have found a polaroid from an old LCD device. It is rectangular in shape and does not have any markings on it. I wanted to somehow determine its axis, maybe not exact. I have tried to use it in ...
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1answer
486 views

Geometrical optics problem [closed]

I Just wanna know the general approach to these problems, Two plane mirrors of length L are separated by distance L and a man $M_2$​ is standing at distance L from the connecting line of mirrors as ...
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1answer
81 views

Why is absorbance calculated as $\log_{10}(1/R)$ and not $1-R$?

According to Lambert Beers law, the absorbance ($A$) of a sample at a given wavelength can be described in terms of its transmittance ($T$) according to: $A = \log_{10}(1/T)$ In near-infrared ...
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0answers
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Wavelength to RGB [closed]

I don't know how to convert $xyz$ chromaticity coordinates in sRGB. For example in What {R,G,B} values would represent a 445nm monochrome lightsource color on a computer monitor? the author takes: $$...
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Velocity vectors during the propagation of photon in elastic scattering question [duplicate]

I have been trouble with the concept of energy of the photon during propagation in random scattered or random continuum medias. E = hf, where E is the energy of the photon in Joules; h is Planck's ...
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2answers
708 views

Calculating total number of fringes in Young's Double Slit Experiment

I know that the $n^{th}$ order maxima can be given by $\frac{n\lambda D}{d}$. But theoretically n can go up to infinity and the intensity will go down. However, is there any way to approximate the ...
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2answers
395 views

Superposition of light waves of different colors

Can someone please assist? My question is regarding visible light. If, for example, red light and blue light are waves of different wavelengths and frequencies then how do they combine with all the ...
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1answer
39 views

Doubt in a figure which explains rainbow formation

This figure is given in wikipedia to explain rainbow formation, l know that if light travels from denser medium to rarer medium and if angle of incidence is greater than crictal angle light will ...
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3answers
123 views

How is energy conserved during simultaneous refraction and reflection of light?

My question is regarding the partial reflection and refraction of light when incident on a refracting surface. Here, the energy of Incident Ray is E=hv of Reflected Ray is E=hv and that of Refracted ...
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2answers
52 views

Why is reflectivity the square of the magnitude of the Fresnel reflection coefficient?

Is there a simple way to derive the formula $R=(\frac{n_1-n_2}{n_1+n_2})^2$ by using high school physics and mathematics?
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1answer
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Is it possible to create usable light from magma?

Say you drilled a hole down to the magma layer. Hot lava emits light. From what I've seen lava is red(?) hot. Then if you put some fibre optic cables down into the magma layer maybe protected at the ...
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2answers
84 views

Single Slit Diffraction Experiment

How is possible for an interference pattern to be created from a single wave? Why is the central maximum twice as wide as the others?
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contrast in confocal microscopy

I observed fixed cells from mice tissue, thanks to confocal microscopy monochromatic 488nm. (without fluorescence staining) In some slices, cells appear in black, and in other slices in white (...
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1answer
35 views

Using a collimating lens for beam interference

If I have two beams of light which are incident on the same point of a collimating lens, will they emerge as a single beam and interfere? I've attached a drawing below: If not, what happens?
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1answer
56 views

Combining light of the same linear polarisation

Is there a way to combine two (coherent) beams that have the same polarisation and wavelength in a lossless manner such that the resultant beam has the same polarisation as the starting beams? I'm ...
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1answer
44 views

Is light penetration through water affected by water pressure?

Does water pressure affect propagation of light through water?
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1answer
35 views

Merging beams using critical angles

If I were to send two beams into an optically dense object such that they are both incident at the critical angle as they try to leave, will both the beams merge at the end of the material? Below is a ...
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2answers
103 views

How does Destructive Interference redistribute energy?

I have tried looking at the many other questions on a similar topic, however, they don't provide a definitive answer to my question. What I managed to gather so far, is that if a light wave is super ...
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1answer
37 views

Why is the UV absorption band for molecules not a sudden transition?

From what I have read, when a molecule in solution or gas is excited, it does so from ground state, but may gain the energy for vibrational transitions as well. This would lead me to expect that there ...
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3answers
123 views

What exactly does the observer's coordinate system mean in special relativity?

This seems like a very basic question but I'm having a hard time understanding it, more precisely hard time visualizing it. Let say there is an observer, and we wish to somewhat formalize his ...
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1answer
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How or where I could experience sonoluminescence in daily life?

Sonoluminescence is a known phenomenon, even if a conclusive explanation for its origin is not given. I wonder if I could ever hear and see sonoluminescence somehow or somewhere in daily life, or if ...
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1answer
41 views

Sending elliptically polarised beams into a reversed beam splitter

If I send two elliptically polarised beams into the outputs of a (say 50:50) beam splitter which is at some angle $\theta$ to the $x$-axis, what sort of beam emerges? As far as I'm aware they do not ...
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1answer
104 views

How is it possible to see a full moon at midday? [closed]

I’m currently doing an observational study of the moon that’s been a passion of mine for the last few years. I’ve found I can see the moon all the way to almost full at about midday). Added I can see ...
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2answers
180 views

Comprehensive Nature of Light: Transverse vs Longitudinal Waves and Ray Optics

----------I understand that we consider light as a transverse wave in the sense that light is composed of E&M fields oscillating perpendicular to each other and the direction of propagation. And I ...
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1answer
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Yellow color, but not really - does it reflect pure yellow light

This question doesnt relate only to yellow, but basicly to all colors. Lets say: I have pure Yellow painting color and also Yellow painting color mixed from Red and Green. If I would turn on pure ...
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3answers
95 views

Single slit diffraction: Why aren't the interference patterns circles?

A picture of the single slit experiment We were all showed this pictures when started learning about the experiment. I assumed the picture was just a simplified 2D model from the 3D world, and to ...
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1answer
70 views

Does sky luminance really decrease in steps as the Sun goes deeper under the horizon?

Playing with some atmospheric scattering simulations, I've come across a fact that, as the Sun goes lower under the horizon, sky luminance (neglecting sources of light other than the Sun) appears to ...
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3answers
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Is there a difference between the red sky in the morning and in the evening?

It certainly has a different feeling to it, but does the temperature or earth's rotation or the clouds or anything else really make it two different physical phenomena or at least different colors? ...