Questions tagged [reflection]

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How do we see an image if converges behind us?

Say we have a concave mirror which is converging light rays from you at a distance $v$ from the mirror where $v>u$. ($u$ is the distance of you from the mirror). So if the light is converging ...
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Proof of the formula regarding multiple reflections at two mirrors

I have recently read about the multiple reflection at two angled mirrors. It says that the number of reflection: $$N=\left(\frac{360}{a}\right)-1$$ where $a$ is the angle between the mirrors such that ...
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1answer
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How pure are the colors of the rainbow?

I just watched this lecture on rainbows https://www.youtube.com/watch?v=iKUSWJWMSk4 and in it I found out that the colors in the rainbow are not monochromatic. At any point in a rainbow there is a ...
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Proof for the no.of images formed by two inclined plane mirrors is 360/theta=n? [closed]

Proof for the no.of images formed by two inclined plane mirrors is 360/theta=n?How is this formula derived?
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Does level of pollution determine if a rainbow will be formed?

Today I saw a rainbow after almost a decade. I live in Noida (a city) in India. Most people I know believe that: we don't see rainbows nowadays because of pollution and now after nearly 3 months since ...
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1answer
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Is it possible to achieve Invisibilty? [closed]

I read that mirrors absorb only a small amount of light(1-2%). And recently MIT engineers developed the "Blackest Black"(blacker than Vantablack) which reflects only 0.005% of the light. Let's say we ...
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1answer
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Low frequency square wave into a parabolic reflector

Imagine a perfect audio speaker creating a planar square wave - driven into a parabolic reflector. The fundamental wavelength is around twice as wide than the parabolic reflectors diameter. I've read ...
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Do you know any good animations for visualization of different cases of image formation for Convex/Concave mirror and Converging/Diverging lens? [closed]

I'm struggling to remember(for my test) different cases of image formation for the Convex/Concave mirror and Converging/Diverging lens? There are so many things to remember like where are the image ...
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1answer
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Optics - Object between two “parallel plane mirrors”

The problem is the question 5.67 of Hecht book - Optics Suppose two mirrors (A and B) are 25 cm apart and a small candle is placed in between them such that you cannot see it. You see the images at $...
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1answer
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Burning Space Mirror Farm

Physicists at MIT have created the first perfect mirror. If this is true, could enough mirrors be directed at a space ship like Archimedes "Burning Mirror" would at a boat from automated solar farm in ...
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1answer
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Which materials are white due to diffuse reflection, and which due to absorption/re-emission of all wavelengths?

Is there any way of knowing which white objects or materials are white due to emission of most or all wavelengths, and which due to diffuse reflection? If there is one type of material I would like ...
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Circular inversion and spherical mirrors

The object distance ($u$), image distance ($v$) and the focal length of a spherical mirror ($f$) are related by the well-known formula (using the appropriate sign convention): $$ \frac{1}{u} + \frac{...
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2answers
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How does a non-infinite monochromatic plane ray of light know which way to refract?

I have been making a simulation of light traveling in medium from classical physics perspective and while trying to makes sence of a traveling wave packet i realized i don't understand something very ...
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2answers
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What force creates the reflected wave in a string attached to a rod? [duplicate]

I am a student of class 11 and I have a doubt about reflection of waves on a string tied to a massless ring which can slide on a frictionless rod. When the wave reaches its end, the ring overshoots ...
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2answers
64 views

Number of images formed when two mirrors are placed at an angle

The formula for calculating the number of images formed when two mirrors are placed at an angle $\alpha$ is $360/\alpha$. My question is how many images will be formed when it is a fraction? My ...
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Why the image of an extended source reflected in a plane mirror will not turn upside down when we move farther away than the point of convergence?

I know the fact that virtual images are always upright and that plane mirrors always form virtual images. In a camera obscura, the light rays from the top and the bottom of the object cross at the ...
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Total Radiance at a sensor

I'm trying to calculate the radiance incident to a spectroradiometer, in order to validate a measurement. I have it mounted in one end of a box along with two bulbs. The inside of the box is painted ...
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5answers
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Inconsistency in ray diagram

This example purports to show reflection of light rays from a spherical mirror. It looks good, until you try to draw a ray from the tip of the candle flame, then through the focal point, $F$, and then ...
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Is $(x,y)\rightarrow (-x,-y)$ an inversion transformation?

Does anyone know whether $(x,y)\rightarrow (-x,-y)$ is an inversion transformation or not? I know that the standard inversion (parity) transformation in two dimensions should be something like $(x,y)\...
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1answer
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How do “see through mirrors” work? [duplicate]

(I called them see through mirrors because I don't know what their actual name is) I have seen a lot of pictures of glass-like materials which reflect light from on side, and from the other side, ...
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2answers
59 views

Why not regular reflection?

Fiber optics make use of total internal reflection for transmitting signals through them. Associated with fiber optics are many kinds of losses such as loss of signals due to light rays entering at ...
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3answers
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How do metals reflect electromagnetic radiation?

Microwaves, for example, can be reflected off metallic surfaces. This seems counter-intuitive, since the metal's electrons could interact with the electric field component of the EM wave and absorb it....
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Color absorption and reflection

Specular or Diffuse Reflection? In this image attached, I have a bulb overhead. The streak of light is the specular reflection of the bulb since I can see an image of it. Does this mean that specular ...
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1answer
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What do we actually mean by parallel rays when talking about reflection from a concave mirror?

If we place a point object at the focus of a concave mirror, we say that the reflected rays would be parallel and would meet at infinity to form an image. What does this mean? I tried to trace the ...
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Device or material that is (near) 100% transparent from one side and (near) 100% reflective from the other side? [duplicate]

Looking out of the window at night from a lit room, you see yourself reflected in the window and, depending on the lightness or darkness outside, you also see things outside. We can say: Some light ...
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How can an object absorb so many wavelengths, if their energies must match an energy level transition of an electron?

I believe I have a misunderstanding of some principles, but I have not, even through quite a bit of research, been able to understand this problem. My current understanding of transmission, ...
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2answers
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Parabolic speaker dish diameter

I am trying to design a parabolic speaker to allow an audio signal to be emitted in only a single direction. For a single acoustic tone with wavelength $w$, what should the diameter of the reflector ...
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1answer
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Reflection off of reflections in silvered glass slabs

Our instructor told us about this phenomenon: The back of the glass slab is silvered, and M' is the front-shifted image of the silvered surface. While explaining reflection off of this, he stated the ...
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Any cool Total Internal Reflection phenomenon ideas for a project? [closed]

I'm doing a project about any TIR phenomenon and was wondering if anyone has a cool idea of what to do. I talked with my teacher about mirages, but she wanted something that was a little more unique. ...
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How can quantum tunnelling be applied to the penetration/reflection of electromagnetic waves?

I am trying to use quantum mechanics to explain the penetrating power of electromagnetic radiations through, say, a thin sheet of glass. I imagine the glass to be a one dimensional potential "wall". $$...
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3answers
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Why do refracting telescopes have a wider field of view than reflecting telescopes?

Many websites say refracting telescopes have a wider field of view than reflecting telescopes, claiming it is because their angular magnification is less. Astronomical objects are therefore easier to ...
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What causes this circular reflection to form?

Holed up at home, I was distracting myself by shining my green laser pointer around. Something particularly interesting happened when I pointed the laser at a reflective black plastic surface. The ...
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2answers
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Is reflection just a re-emitted wavelength at the electronic scale? Does reflection require absorption in the first place?

I'm researching on how different wavelengths choose to either reflect, get absorbed, or transmit through a particular material. I've read that transmission is when waves do not interact with the ...
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1answer
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When light is reflected, is there ever an instant where it is at rest or is reflection instantaneous?

If a photon travels at $+c$ velocity and reflected to $-c$ it follows that there must be $0$ in between these velocities, just as if you threw a ball at a wall. But that presents a problem, as light ...
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What is Scattering of light?

Scattering of light is a Diffraction or Reflection? I mean if a wave of light collide with a particle it just goes in a different pass in respect the angle of crash or it Diffract in different pass ...
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1answer
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Emission of heat from absorption of light photon

So I've recently learned about photoelectric effect. It made sense at first, but when I try to combine it with what I thought I knew about emission and reflection of photon, things become rather messy....
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1answer
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Intuitive explanation for why reflected waves change phase by $π$? [duplicate]

I have seen the equations that show the coefficient of reflection etc. But I'm searching for an intuitive rather than solely mathematical explanation for why waves change phase by π when reflected (...
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2answers
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What factor decides that when will scattering happen and when will reflection?

I don't understand what is the difference between Scattering and reflection? I have searched and found that in scattering, the atom absorb and re emits the photon, while reflection is due to particle ...
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Eye seen in sunglasses reflection

Today while laying down on the floor, enjoying morning sunlight I have noticed an interesting phenomenon. It is important to mention that I was wearing sunglasses - just regular, without any ...
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How to find the fraction of light absorbed by a surface?

How to find the fraction of light absorbed by a surface? What values do we need? I am trying to find the fraction of light absorbed by a surface when it's dry and when it's wet. I have something ...
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How to find the probability reflection at a liquid-air interface for a surface which reflects diffusely according to Lambert's law?

The smooth surface is air-liquid interface and the rough surface is let's say a t-shirt. The image above shows the probability of each reflection, and the $p$ value is the probability of the light ...
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4answers
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Incident and reflected waves

Let's consider a transversal wave on a string, which is reflected on a wall. I understand that the velocity of the incident and reflected wave are equal. However, I don't understand why the ...
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Visualisation of asymmetric placement of an object between two inclined mirrors

Suppose two mirrors are inclined at an angle $x$ such that $n = 360/x$ is an odd integer. If the object is at the angle sector then the number of images is $n-2$, I found the diagram for this case ...
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Partial reflection for fast communication

I've been rewatching the Feynman Auckland lectures and have a question about using partial reflection as a communication medium. Say you had two glass lenses in a vacuum, positioned several miles ...
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Effective Refractive Index: Where does this formula come from? [duplicate]

In the paper, entitled "Artificial uniaxial and biaxial dielectrics with use of two-dimensional subwavelength binary gratings" by Eric B. Grann, M. G. Moharam, and Drew A. Pommet. https://www....
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1answer
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How to calculate the fraction of light rays reflected?

The smooth surface is air-liquid interface and the rough surface is let's say a t-shirt. The image above shows the probability of each reflection, and the $p$ value is the probability of the light ...
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0answers
42 views

Effective Refractive Index in Paper

I am reading the paper, entitled "Artificial uniaxial and biaxial dielectrics with use of two-dimensional subwavelength binary gratings" by Eric B. Grann, M. G. Moharam, and Drew A. Pommet. https://...
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2answers
85 views

Interesting generalisation about a parallel ray between 2 mirrors

I have been self studying from home nowadays and came across a result in a video lecture on 'Ray Optics' If an incident ray is parallel to one of the 2 mirrors kept an angle $\theta$ = $\frac{\...
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3answers
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EM wave reflection on a perfect conductor

Suppose the region $x>0$ of 3D space is a perfect conductor, and the region $x<0$ is vacuum. You send a monochromatic plane wave $\vec{E_i}=\vec{E_0}e^{i(\omega t-kx)}$ from the left to the ...
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Reflection in stationary waves

A stationary wave is formed by the superposition of two waves with the same frequency and amplitude travelling at the same speed in opposite direction. Consider a wave generated by a vibrator is ...

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