Questions tagged [reflection]

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Change rate of reflection vs. incident angle

It is known that the reflection on the surface could be determined by Fresnel equations. The reflection increases as the incident angle of light becomes bigger. When we look at the change rate of ...
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1answer
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Image formation for concave mirror when object is at centre of curvature

Everywhere I see it is quoted that when an object is at C its reflected image by a concave mirror will also be at C (and be inverted and equal-sized), but when I draw it this is impossible, it always ...
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Reflection prison [on hold]

So I came up with this idea of a "reflection prison". I do not know if the idea exists already under a different name. Say you are in front of an exact copy of you in a perfectly symmetrical room. To ...
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Acoustics in heterogeneous medium: Reflection and Tranmission

I am trying to understand the effect of changing impedance on acoustic pressure wave. I have attached the image from the book "Fundamentals of Acoustics"(Kinsler et. al)(r1 and r2 are the impedance of ...
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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 ...
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4answers
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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 ...
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Appearence of colors on heated ceramic surface

I've recently noted that whenever I put hot food or blow hot air on the plates I have home, the following colors appear on the slightly heated areas and disappear quickly as the plate cools down again....
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1answer
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Why does the Complex Index of Refraction take part in the Reflection?

I'm aware that in Optics, the complex index-of-refraction $\eta = n+ik$ is used, which famously leads to the reflection property at an incident angle, i.e. Fresnel's law: $$R=\frac{(n-1)^2+k^2}{(n+1)^...
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Reflectance and transmittance equations for metal thin film

The Fresnel's equations no long work when the thickness of the metal thin film is thinner than skin depth. For example, the reflectance of a metal thin film is always the same according to fresnel's ...
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1answer
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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. ...
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Modeling Diffuse and Specular Reflection Intensities with inverse square law

I need to simulate the signal a sensor would receive upon observing an object being hit with a laser. I've got a model for the laser (using a gaussian beam). My plan thus far is to do the following: ...
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1answer
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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. ...
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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 ...
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1answer
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Why thickness of metal thin film will affect reflectance?

The reflection of the interface of two layers is described by Fresnel's equations. For instance, the reflectance of an Al bulk at 1 micron is around 0.9, this is the reflectance of the interface ...
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1answer
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The facts of travelling at the speed of light [duplicate]

I’m travelling at the speed of light. If I hold a mirror in front of me could I see my face?
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1answer
48 views

Acoustics: Reflection and Transmission Coefficients

While studying about reflections and transmission coefficient in a discontinuous Media I came across two definition of coefficients one which seems to be correct according to me as it is in accordance ...
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Destructive interference by a hard boundary

" Wavefronts on reflection off of a hard boundary ( rigid boundary ) have their phases inverted. " This is something I've learnt. " Waves with same amplitude and opposite phases destructively ...
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3answers
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Why does an object immersed in water look less shiny than in air?

I was surprised to learn today that objects look less shiny when immersed in water. Presumably it's because of the different index of refraction of the transparent medium, but why? Source: https://...
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Why does light seem to reflect preferentially off surfaces and interfaces even when the stuff in question is non-opaque?

Glass is said to reflect about 4% of incident light. The other 96% is either absorbed or transmitted. That 4% seems to reflect from the surface of the glass. From the perspective of a 'stream of ...
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Polishing Spherical Refracting surface vs Lens

My text book states that When we polish a spherical refracting surface (sphere) it doesn't behave as spherical surface and mirror .It still behaves as spherical surface. The polished side is just ...
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1answer
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Relativity and Reflection

Suppose that you have a hollow pipe of some sort long enough to cover the distance between earth and another planet approximately 4000 light years away. The setup is done is such a way that a room is ...
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1answer
39 views

Can a system be engineered to cause a standing wave resonance with gravitational waves

Can a system be engineered to cause a standing wave resonance with gravitational waves? It appears that gravity waves can be reflected. Do Mirrors for Gravitational Waves Exist? Stephen J. Minter, ...
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5answers
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2 windows - will I see the reflections?

I have a question regarding photons nature. Let's say I have a single source of light - regular bulb and the observer - in the same room. The observer looks through a glass window (normal glass ...
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How far will the imaging be? And is it possible to make it farther?

So currently I'm trying to make a smart glasses, where you have a projector that projects an image onto transparent flat glass, and some of the light will reflect into your eyes (something like the ...
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1answer
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Do clouds reflect radio waves?

Do clouds reflect radio waves? Specifically, those waves used in radars. And, what kind of matter refracts or reflects radio waves?
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2answers
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How do lens capture reflections clearly?

In an optical system which uses lenses (cameras, our eye) multiple rays from the same point are conveyed in a single point on the retina / image sensor. This is typically shown as in the image below. ...
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1answer
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“Partial” Total Internal Reflection

Can partial TIR happen? Consider the image present in this link Here, at point D, TIR happens, but also there is transmission. Is "total" internal reflection a misnomer?
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Calculating the reflection and solute permeability for a diffusion cell

Here is the question, at which I have some problem. 'The three characteristic parameters $\sigma$, $L_p$ and $\omega$ can be determined from two experiments; in the first experiment 4.6 ml of water ...
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1answer
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How do car rear-view mirrors work? [closed]

I wonder, how does a car rear-view mirror work? When there is a car behind me with high-beam, all I do is flip a tong at the bottom of the mirror to relax the lights! Are there two mirrors in it, ...
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1answer
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Faraday cages and what constitutes the minimum number of atoms to build an optical mirror

I recently asked this question: What is the minimum number of metal atoms necessary to make a mirror? However it seems I did not make myself clear enough about what I was looking for, even though the ...
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3answers
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How can a double slit interference pattern be created without out going through a double slit

When I create a double slit in a mirror by removing the paint and silver I get a beautiful interference pattern. What’s interesting to me is that I get one in the opposite direction too. What has me ...
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0answers
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Young slits, mirrors and interference patterns [duplicate]

Why do Young slits projecting via an intermediary mirror to a screen still shows the normal pattern of interference? This happens even though the mirror is so close that not all interference is ...
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0answers
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Individual air molecule momentum exchange

Background: Looking at this illustration about solar radiation pressure on a perfect reflective surface, incident photon exchanges its momentum to the slanted surface which provides a reaction force ...
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1answer
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What is the minimum number of metal atoms necessary to make a mirror?

I am still unsatisfied with what I have read so far about the physical basis of metallic mirrors reflectivity. In particular, I am skeptical about the idea that individual electrons serve as mirrors ...
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Quantum mechanics of refraction and reflection? [duplicate]

I learnt that light bends when passing through different mediums is due to the epsilon which is how much the strength of electric and magnetic field in the direction of travel changes in the material, ...
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Determine whether a mirror is convex or concave from image magnitude, distance and reality

An object is placed 1.5m in front of each of three mirrors, (i), (ii) and (iii) with the following results: i) The image is real and 1.5m from the mirror. ii) The image is virtual and 1.0m from the ...
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Image Formation in plane mirror

I just read that in image formation by plane mirror the rays can't go above the height of the object and below principal? Whereas in concave/convex mirror the light ray can go above/below . Why is it ...
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2answers
139 views

How does the electron know to “release” the photon at the same angle at which it got absorbed? [duplicate]

This is a quote from Wikipedia: In classical electrodynamics, light is considered as an electromagnetic wave, which is described by Maxwell's equations. Light waves incident on a material induce ...
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What powdered material can be regarded as an ideal Near UV reflector?

I'm looking for some common powder material (like alumina) that's nearly 100% reflective in UV region, to make a compacted power target to use as a reference for 100% reflectance. Or, at least, some ...
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2answers
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Why does the electric field and not the magnetic field remains in the same direction after reflection from a medium?

I was reading up about reflection and transmission when an electromagnetic wave is normally incident on a surface. I came across this figure : My question is why is the direction of electric field ...
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Why isn't there aberration in parabolic mirrors?

It is known that aberration happens in spherical mirrors due to the fact that all reflected lights doesn't pass through the focal point. But how would you prove this doesn't happen on parabolic ...
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3answers
66 views

Why electricity does not seem to alter metal mirrors reflection? [closed]

If individual electrons absorb and reflect photons, and if those electrons happen to be on a conduction band which is most probable as the outer electrons have a greater probability of intercepting ...
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1answer
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What does the person looking from the point of the image which is behind see?

In a plane mirror, the image of an object is virtual and is behind the image of another object. What does the observer looking from the point of the image which is behind see?
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Zebra and Donkey Watching [closed]

Suppose I have a white donkey in front of me. Say i paint black stripes on the objective of my camera lens and click a photo of it. The context of this question is that when we cover a lens ...
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1answer
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Parabola black body heating

I'm having trouble figuring out why this following example of shenanigans wouldn't work. If you take a parabolic mirror (say from polished aluminium) with a magnification of M and construct it such ...
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Explanation about light reflection in Feynman's QED

In his book QED, Feynman explained how the probability of light reflecting from a mirror can be calculated by summing unit vectors, with their direction representing the phase of the wavefunctions. ...
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1answer
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How momentum is conserved when left circularly polarized light hits a mirror?

I read that 2 light planes with same amplitude are set perpendicular to each other will create a circularly polarized light, but I am curious that when it is reflected back and is converted from left ...
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1answer
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Does Huygens Principle of reflection take polarization into account?

There are many applets on the internet which demonstrate Huygens Principle or reflection/refraction geometrically. This is one such example: https://www.olympus-lifescience.com/zh/microscope-resource/...
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Image formation in Ray Optics

Can a refracted ray and a reflected ray form an image( different incident rays coming from the same object, one sufferning reflection and other refraction)? What is the criteria for forming an "image"...
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Periodic waves traveling on an ideal flat sea and the reflection of the Sun

Suppose sinusoidal parallel waves (with equal wavelengths and amplitudes) are traveling in different directions on an ideally flat sea. The Sun is shining, let's say, $30^0$ above the horizon and the ...